Add title attribute to "Link to this..." and other links

[eksperimental]

Taken from #730 (comment) and #730 (comment)
Related PR: #730

One thing that if it will not improve search results in search engines it will still be useful is to use the full mfa in the title of every link, for every module, function, type, etc.

So we could have something link:

<a href="#fetch/2" title="Enum.fetch/2">fetch/2</a>

or have this:

<a href="#fetch/2" class="detail-link" title="Link to Enum.fetch/2">

instead of this:

<a href="#fetch/2" class="detail-link" title="Link to this function">

/cc @CRYIC

[matlc]

Thanks for breaking this into its own issue @eksperimental . I've started this and hope to have something up this week.

[wojtekmach]

@CRYIC ping :)

[matlc]

@wojtekmach Thanks for the ping! I got through some of this but haven't completed it yet. I'm going to setup time to finish and post a PR soon. Let me know if you have any thoughts/concerns.

[wojtekmach]

@CRYIC no worries and no rush, I was just checking if you're still working on it in case anyone else wants to pick this up in the meantime. Let us know if you run into any issues!

[wojtekmach]

Closing in favour of PR.