Add sponsors to index page

[jnewbery]

This adds our sponsors to the home page.

[jnewbery]

@harding - this adds the data, but it doesn't look very good yet!

It'd be nice if we could have the sponsors presented in a grid, similar to how the contributors were shown in bitcoincore.org prior to bitcoin-core/bitcoincore.org@c8618b1. Is that possible within the minimal jekyll theme that we're using?

[jnewbery]

I've added fontawesome to address the comment here: #10 (comment) . @harding - do the last two commits look like the right approach?

I'm still waiting to get a good quote from Wences, and probably also update the quote from Chaincode.

[harding]

@jnewbery LGTM with one suggestion:

diff --git a/assets/css/main.scss b/assets/css/main.scss
index 6e2907b..91a0511 100644
--- a/assets/css/main.scss
+++ b/assets/css/main.scss
@@ -34,11 +34,13 @@ br.clear {
 
 p.sponsor-quote {
         font-style: italic;
+        margin-top: 20px;
 }
 
 .sponsors h3 {
         font-weight: 700;
         font-size: 120%;
+        margin-bottom: 0;
 }
 
 // The long text quotes make this application of a two-column list

Currently it's,

Name

Twitter
Paragraph of text

This makes it,

Name
Twitter link

Paragraph of text

Which seems more natural to me.

[jnewbery]

Updated CSS as suggested by harding, and added quote for Chaincode. Just need to wait for Wences quote.

[jnewbery]

rebased

[jnewbery]

I have approval for all three quotes from the sponsors, so I think this is ready for merge.

@harding / @moneyball - are you happy for this to go in?

[harding]

Tested ACK ff20bcc