Add fa-icon for 'Donate' in nav

[mittalprince]

Fixes #4441 (<=== Add issue number here)

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[oorjitchowdhary]

Hi @mittalprince.. This looks good..
But can you please upload a screenshot showing that this is working properly on your localhost

[Rishabh-Kumar-Bothra]

Please attach a screen shot or gif of the solution as it makes easy to review changes.
thank you

[mittalprince]

@geekychaser @oorjitchowdhary this working, please review.
thanks

[Rishabh-Kumar-Bothra]

@mittalprince great , i think this is ready for merge but requires confirmation from @jywarren @publiclab/community-reps

[oorjitchowdhary]

@SidharthBansal I think we can merge this..

[SidharthBansal]

I think this requires confirmation of @jywarren. I think we need to change the fa icon to something else.
Thanks for contributing at pl.

[jywarren]

Hi, this looks good but there may be some width wrapping issues at wider sizes. Could you check out #4502 and perhaps this could address that as well as resolve it for this PR? Thank you!!

[jywarren]

Opened a related issue here! #4690

[grvsachdeva]

Closing all navbar icon related issues and we'll add icons in a single PR whenever ready. Thanks!

cc/ @jywarren