Merge branch 'network-assets' into 'master'

Replace raphael-rails with raphael.js and split it from the rest of the JS

## What does this MR do?

Removes raphael.js and its related libraries from the default JS bundle.

It also removes raphael-rails because the gem is unmaintained and – for whatever reason – didn't want to cooperate with the way I was trying to require it.

This brings the default (compressed and minified) application.js from 354KB after the d3 MR (!4394) down to 324KB.

## Are there points in the code the reviewer needs to double check?

That tests pass and that there aren't errors on any pages (especially the Network page).

## Why was this MR needed?

It's only used on the Network page and was using way too much bandwidth for just one page.

## What are the relevant issue numbers?

#14372 #13165 

Follow-up to !4394 and !4516.

cc: @jschatz1 

See merge request !4519

1 files changed, 0 insertions, 1 deletions

diff --git a/Gemfile b/Gemfile
index 3b287893002..1a7af66fac4 100644
--- a/Gemfile
+++ b/Gemfile
@@ -227,7 +227,6 @@ gem 'gon',                '~> 6.0.1'
 gem 'jquery-atwho-rails', '~> 1.3.2'
 gem 'jquery-rails',       '~> 4.1.0'
 gem 'jquery-ui-rails',    '~> 5.0.0'
-gem 'raphael-rails',      '~> 2.1.2'
 gem 'request_store',      '~> 1.3.0'
 gem 'select2-rails',      '~> 3.5.9'
 gem 'virtus',             '~> 1.0.1'