fix icons error by preloading FA 5 first

[Tlazypanda]

Fixes #8023

Fixed icons error by preloading FA 5 first thus preventing it to overwrite css properties of FA 4.7 icons and only being used to cater to classes fas far fab etc.

• PR is descriptively titled 📑 and links the original issue above 🔗
• tests pass -- look for a green checkbox ✔️ a few minutes after opening your PR -- or run tests locally with rake test
• code is in uniquely-named feature branch and has no merge conflicts 📁
• screenshots/GIFs are attached 📎 in case of UI updation
• ask @publiclab/reviewers for help, in a comment below

Thanks!

[codecov]

Codecov Report

Merging #8041 into master will decrease coverage by 4.73%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #8041      +/-   ##
==========================================
- Coverage   82.34%   77.60%   -4.74%     
==========================================
  Files          99       99              
  Lines        5737     5840     +103     
==========================================
- Hits         4724     4532     -192     
- Misses       1013     1308     +295     

Impacted Files	Coverage Δ
app/controllers/openid_controller.rb	0.00% <0.00%> (-53.85%)	⬇️
app/controllers/comment_controller.rb	72.34% <0.00%> (-14.90%)	⬇️
app/controllers/users_controller.rb	71.18% <0.00%> (-11.12%)	⬇️
app/models/comment.rb	68.96% <0.00%> (-7.94%)	⬇️
app/controllers/application_controller.rb	84.61% <0.00%> (-7.70%)	⬇️
app/controllers/home_controller.rb	91.93% <0.00%> (-6.46%)	⬇️
app/controllers/admin_controller.rb	72.15% <0.00%> (-5.91%)	⬇️
app/models/spamaway.rb	92.30% <0.00%> (-2.57%)	⬇️
app/controllers/notes_controller.rb	81.74% <0.00%> (-1.66%)	⬇️
app/controllers/user_sessions_controller.rb	65.21% <0.00%> (-1.25%)	⬇️
... and 2 more

[Tlazypanda]

@jywarren can you kindly review and merge? Thanks ✌️