Externalize jquery with jquery-rails gem and cdn option

[Tlazypanda]

Please describe the desired behavior.
Currently the jquery is fetched from public/lib. We can add it as a jquery-rails gem and its cdn gem.
Cdn option will allow us to load jquery faster since it might be already present in the cache. If the cdn goes down then the jquery-rails gem will load jquery for us as a fallback. The link of the gems can be found here,here and here.

Most importantly it will allow us to run the application.js file with defer/asynvc attribute. Earlier it would not have been possible since jquery was present in application.js so if we tried to run it with async tab then inline scripts in html files requiring jquery would have through an error.

[Tlazypanda]

@jywarren @emilyashley @cesswairimu @SidharthBansal This issue requires some amount of discussion before proceeding further. Can you kindly have a look and share your thoughts on if we should go for this? Thanks ✌️

[Tlazypanda]

Hey @jywarren @cesswairimu @emilyashley Looking forward to your input on this 😅

[cesswairimu]

Aha!, nteresting...I havent worked with jquery-rails before let me take a look at it. Thanks @Tlazypanda

[Tlazypanda]

Hey @cesswairimu Should I also make a pull request for this and test it out in the unstable server? 😅 Thanks ✌️

[cesswairimu]

sure, go ahead @Tlazypanda