doc: Make Gitter + StackOverflow links more prominent?

[eacousineau]

I've seen quite a few issues that aren't really bug reports or feature requests; the issues templates does direct people to use Gitter, but it seems that there are still quite a few issues that get by.

Would it help to make a "Getting Help" section in the RTD docs, perhaps right under "About this project", to point to Gitter / StackOverflow?

(I'm posting this assuming that this is not a huge issue, but perhaps could still be optimized. If this is a complete non-issue, feel free to close this!)

[eacousineau]

Will try to incorporate a quick link to Gitter chat + StackOverflow in issue template; that (I think) would resolve this bit.

[YannickJadoul]

I think we can close this now, especially after @henryiii's #2377, no? If not, please reopen, @eacousineau/@EricCousineau-TRI :-)

[EricCousineau-TRI]

Yup, looks better - thanks!