Fix for images (alshedivat#271)

When you fork this directory in your local fork, if you remove images from assets, the README file will be broken.
This should fix the README problem, ensuring that images are always up-to-date from the assets folder of the original al-folio folder.

README.md

@@ -2,7 +2,7 @@
 
 [![build status](https://travis-ci.org/alshedivat/al-folio.svg?branch=master)](https://travis-ci.org/alshedivat/al-folio)
 [![demo](https://img.shields.io/badge/theme-demo-brightgreen.svg)](https://alshedivat.github.io/al-folio/)
-[![GitHub contributors](https://img.shields.io/github/contributors/alshedivat/al-folio.svg)](https://GitHub.com/alshedivat/al-folio/graphs/contributors/)
+[![GitHub contributors](https://img.shields.io/github/contributors/alshedivat/al-folio.svg)](https://github.com/alshedivat/al-folio/graphs/contributors/)
 ![GitHub release (latest SemVer)](https://img.shields.io/github/v/release/alshedivat/al-folio)
 ![GitHub](https://img.shields.io/github/license/alshedivat/al-folio?color=blue)
 [![GitHub stars](https://img.shields.io/github/stars/alshedivat/al-folio)](https://github.com/alshedivat/al-folio)
@@ -12,7 +12,7 @@
 A simple, clean, and responsive [Jekyll](https://jekyllrb.com/) theme for academics.
 If you like the theme, give it a star!
 
-[![Preview](assets/img/al-folio-preview.png)](https://alshedivat.github.io/al-folio/)
+[![Preview](https://raw.githubusercontent.com/alshedivat/al-folio/master/assets/img/al-folio-preview.png)](https://alshedivat.github.io/al-folio/)
 
 
 ## User community
@@ -242,7 +242,7 @@ Your publications page is generated automatically from your BibTex bibliography.
 Simply edit `_bibliography/papers.bib`.
 You can also add new `*.bib` files and customize the look of your publications however you like by editing `_pages/publications.md`.
 
-<p align="center"><img src="assets/img/publications-screenshot.png" width=800></p>
+<p align="center"><img src="https://raw.githubusercontent.com/alshedivat/al-folio/master/assets/img/publications-screenshot.png" width=800></p>
 
 <details><summary><strong>Author annotation:</strong></summary>
 
@@ -287,7 +287,7 @@ The theme comes with two default collections: `news` and `projects`.
 Items from the `news` collection are automatically displayed on the home page.
 Items from the `projects` collection are displayed on a responsive grid on projects page.
 
-<p align="center"><img src="assets/img/projects-screenshot.png" width=700></p>
+<p align="center"><img src="https://raw.githubusercontent.com/alshedivat/al-folio/master/assets/img/projects-screenshot.png" width=700></p>
 
 You can easily create your own collections, apps, short stories, courses, or whatever your creative work is.
 To do this, edit the collections in the `_config.yml` file, create a corresponding folder, and create a landing page for your collection, similar to `_pages/projects.md`.
@@ -301,7 +301,7 @@ To do this, edit the collections in the `_config.yml` file, create a correspondi
 
 The theme allows you to create blog posts in the [distill.pub](https://distill.pub/) style:
 
-<p align="center"><a href="https://alshedivat.github.io/al-folio/blog/2018/distill/" target="_blank"><img src="assets/img/distill-screenshot.png" width=700></a></p>
+<p align="center"><a href="https://alshedivat.github.io/al-folio/blog/2018/distill/" target="_blank"><img src="https://raw.githubusercontent.com/alshedivat/al-folio/master/assets/img/distill-screenshot.png" width=700></a></p>
 
 For more details on how to create distill-styled posts using `<d-*>` tags, please refer to [the example](https://alshedivat.github.io/al-folio/blog/2018/distill/).
 
@@ -310,8 +310,8 @@ For more details on how to create distill-styled posts using `<d-*>` tags, pleas
 **al-folio** supports fast math typesetting through [KaTeX](https://katex.org/) and code syntax highlighting using [GitHub style](https://github.com/jwarby/jekyll-pygments-themes):
 
 <p align="center">
-<a href="https://alshedivat.github.io/al-folio/blog/2015/math/" target="_blank"><img src="assets/img/math-screenshot.png" width=400></a>
-<a href="https://alshedivat.github.io/al-folio/blog/2015/code/" target="_blank"><img src="assets/img/code-screenshot.png" width=400></a>
+<a href="https://alshedivat.github.io/al-folio/blog/2015/math/" target="_blank"><img src="https://raw.githubusercontent.com/alshedivat/al-folio/master/assets/img/math-screenshot.png" width=400></a>
+<a href="https://alshedivat.github.io/al-folio/blog/2015/code/" target="_blank"><img src="https://raw.githubusercontent.com/alshedivat/al-folio/master/assets/img/code-screenshot.png" width=400></a>
 </p>
 
 #### Photos