Remove unnecessary lines from assets.rb

[damianhxy]

Your environment
master (c5a0d53)

Current behavior
Currently, config/initializers/assets.rb has a list of paths to files that should be precompiled for production. However, it appears that most of them are redundant owing to the use of wildcards such as *.css and *.js

Besides, having to manually add a line for every new js or css file is error-prone.

Expected behavior
We should remove unnecessary precompile lines and verify that production autolab still functions.

Comments
I haven't been able to get production autolab running using the bare-metal Autolab installation.

We could possibly test this using autolab docker.

Alternatively, we could do the following

• Run RAILS_ENV=development bundle exec rake assets:precompile
• Check the list of precompiled files in public/assets
• Removing unnecessary lines, purge the directory
• Run the command again and compare the new list of files

Potential references:

• https://stackoverflow.com/questions/18255716/config-assets-precompile-include-a-folder-of-files-or-kill-the-precompile-fe?noredirect=1&lq=1
• https://stackoverflow.com/questions/10097993/rails-config-assets-precompile-setting-to-process-all-css-and-js-files-in-app-as?noredirect=1&lq=1