Added support for multiple profiles in about page (alshedivat#1243)

Addresses alshedivat#963.

Supports two setups: getting profile text from page content.

```markdown
---
layout: about
title: about
permalink: /
subtitle: <a href='#'>Affiliations</a>. Address. Contacts. Moto. Etc.

profiles:
  # if you want to include more than one profile, just replicate the following block
  # and create one content file for each profile inside _pages/
  - align: right
    image: prof_pic.jpg
    # content: about_einstein.md
    image_circular: false # crops the image to make it circular
    more_info: >
      <p>555 your office number</p>
      <p>123 your address street</p>
      <p>Your City, State 12345</p>

news: true  # includes a list of news items
selected_papers: true # includes a list of papers marked as "selected={true}"
social: true  # includes social icons at the bottom of the page
---

Write your biography here. Tell the world about yourself. Link to your favorite [subreddit](http://reddit.com). You can put a picture in, too. The code is already in, just name your picture `prof_pic.jpg` and put it in the `img/` folder.

Put your address / P.O. box / other info right below your picture. You can also disable any these elements by editing `profile` property of the YAML header of your `_pages/about.md`. Edit `_bibliography/papers.bib` and Jekyll will render your [publications page](/al-folio/publications/) automatically.

Link to your social media connections, too. This theme is set up to use [Font Awesome icons](http://fortawesome.github.io/Font-Awesome/) and [Academicons](https://jpswalsh.github.io/academicons/), like the ones below. Add your Facebook, Twitter, LinkedIn, Google Scholar, or just disable all of them.
```

Or getting profile text from `content` (useful when having multiple
profiles).

```markdown
---
layout: about
title: about
permalink: /
subtitle: <a href='#'>Affiliations</a>. Address. Contacts. Moto. Etc.

profiles:
  # if you want to include more than one profile, just replicate the following block
  # and create one content file for each profile inside _pages/
  - align: right
    image: prof_pic.jpg
    content: about_einstein.md
    image_circular: false # crops the image to make it circular
    more_info: >
      <p>555 your office number</p>
      <p>123 your address street</p>
      <p>Your City, State 12345</p>
  - align: left
    image: prof_pic.jpg
    content: about_einstein.md
    image_circular: false # crops the image to make it circular
    more_info: >
      <p>555 your office number</p>
      <p>123 your address street</p>
      <p>Your City, State 12345</p>

news: true  # includes a list of news items
selected_papers: true # includes a list of papers marked as "selected={true}"
social: true  # includes social icons at the bottom of the page
---
```

Which looks like this:

![image](https://user-images.githubusercontent.com/31376482/223251956-aec09f92-55c4-4a17-8ab6-0b30da0970cc.png)

---------

Signed-off-by: George Araújo <george.gcac@gmail.com>
Signed-off-by: George Araujo <george.gcac@gmail.com>

_layouts/about.html

@@ -29,9 +29,9 @@ <h1 class="post-title">
               alt=page.profile.image
               cache_bust=true -%}
             {% endif -%}
-            {%- if page.profile.address %}
-            <div class="address">
-              {{ page.profile.address }}
+            {%- if page.profile.more_info %}
+            <div class="more-info">
+              {{ page.profile.more_info }}
             </div>
             {%- endif %}
           </div>

_layouts/profiles.html

@@ -0,0 +1,49 @@
+---
+layout: default
+---
+
+<!-- about.html -->
+      <div class="post">
+
+        <article>
+          {% if page.profiles -%}
+          {% for profile in page.profiles %}
+          {% unless forloop.first %}
+          <hr>
+          {% endunless %}
+          <div class="profile float-{%- if profile.align == 'left' -%}left{%- else -%}right{%- endif -%}">
+            {%- if profile.image %}
+              {%- assign profile_image_path = profile.image | prepend: 'assets/img/' -%}
+
+              {% if profile.image_circular %}
+                {%- assign profile_image_class = "img-fluid z-depth-1 rounded-circle" -%}
+              {% else %}
+                {%- assign profile_image_class = "img-fluid z-depth-1 rounded" -%}
+              {% endif %}
+
+              {% include figure.html
+              path=profile_image_path
+              class=profile_image_class
+              alt=profile.image -%}
+            {% endif -%}
+            {%- if profile.more_info %}
+            <div class="more-info">
+              {{ profile.more_info }}
+            </div>
+            {%- endif %}
+          </div>
+
+          <div class="clearfix">
+            {% if profile.content -%}
+            {% capture profile_content %}{%- include_relative {{ profile.content }} %}{% endcapture %}
+            {{ profile_content | markdownify }}
+            {%- else -%}
+            {{ content }}
+            {%- endif %}
+          </div>
+
+          {% endfor %}
+          {%- endif %}
+        </article>
+
+</div>

_pages/about.md

@@ -8,7 +8,7 @@ profile:
   align: right
   image: profile.jpg
   image_circular: false # crops the image to make it circular
-  address: >
+  more_info: >
     <p>Office 69a</p>
     <p>Teslova 30</p>
     <p>1000 Ljubljana</p>

_pages/about_einstein.md

@@ -0,0 +1,5 @@
+Write your biography here. Tell the world about yourself. Link to your favorite [subreddit](http://reddit.com). You can put a picture in, too. The code is already in, just name your picture `prof_pic.jpg` and put it in the `img/` folder.
+
+Put your address / P.O. box / other info right below your picture. You can also disable any these elements by editing `profile` property of the YAML header of your `_pages/about.md`. Edit `_bibliography/papers.bib` and Jekyll will render your [publications page](/al-folio/publications/) automatically.
+
+Link to your social media connections, too. This theme is set up to use [Font Awesome icons](http://fortawesome.github.io/Font-Awesome/) and [Academicons](https://jpswalsh.github.io/academicons/), like the ones below. Add your Facebook, Twitter, LinkedIn, Google Scholar, or just disable all of them.

_pages/dropdown.md

@@ -4,7 +4,7 @@ title: submenus
 nav: false
 nav_order: 6
 dropdown: true
-children: 
+children:
     - title: publications
       permalink: /publications/
     - title: divider

_pages/profiles.md

@@ -0,0 +1,28 @@
+---
+layout: profiles
+title: people
+permalink: /people/
+subtitle: <a href='#'>Affiliations</a>. Address. Contacts. Moto. Etc.
+nav: true
+nav_order: 6
+
+profiles:
+  # if you want to include more than one profile, just replicate the following block
+  # and create one content file for each profile inside _pages/
+  - align: right
+    image: prof_pic.jpg
+    content: about_einstein.md
+    image_circular: false # crops the image to make it circular
+    more_info: >
+      <p>555 your office number</p>
+      <p>123 your address street</p>
+      <p>Your City, State 12345</p>
+  - align: left
+    image: prof_pic.jpg
+    content: about_einstein.md
+    image_circular: false # crops the image to make it circular
+    more_info: >
+      <p>555 your office number</p>
+      <p>123 your address street</p>
+      <p>Your City, State 12345</p>
+---

_sass/_base.scss

@@ -120,7 +120,7 @@ blockquote {
 .profile {
   width: 100%;
 
-  .address {
+  .more-info {
     margin-bottom: 5px;
     margin-top: 5px;
     font-family: monospace;