✨ Add icon to menu items

[RocKhalil]

Description

Add icons to the sub-menus. This will give more life to the sidebar.

# in config/initializers/avo.rb
config.main_menu = -> do
  dashboard :dashy, icon: "bolt"
  resource :comments, icon: "chat-bubble-bottom-center-text"
end

Checklist:

• [ X] I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

Manual review steps

1. Add icon: 'user' next to the resource
2. Watch it appear in the menu

Manual reviewer: please leave a comment with output from the test if that's the case.

[codeclimate]

Code Climate has analyzed commit 8dd3d8c and detected 0 issues on this pull request.

View more on Code Climate.

[adrianthedev]

Thank you for your contribution @RocKhalil!