syncing footer urls with plotly/next

[jdamiba]

This PR syncs the footer URLs in this repo with those in plotly-next.

This should have been accomplished by #1438 but either I made a mistake or the URLs have changed in the interim, or both.

[michaelbabyn]

I'm not sure if there were any changes since https://github.com/plotly/plotly-next/issues/442#issue-475840131 but if there weren't, I've left a few changes below.

[jdamiba]

@michaelbabyn This PR mirrors the footer that is currently live on https://plot.ly in terms of the inclusion of Developer Support and the URL for Documentation. Given that https://github.com/plotly/plotly-next/issues/442 was closed 18 days ago, I think that what is live today represents the standard that should be synced to?

[michaelbabyn]

@VeraZab , do you have any insight on why the changes made to plotly/next from https://github.com/plotly/plotly-next/issues/442#issue-475840131 don't appear to have taken effect? I.e the link to "developer support" is still there and the documentation link still points to help.plot.ly.

[VeraZab]

i'm really not sure why this happened, but i see that we had 2 pathways through which we decided how to make our footer look (Prismic, and one hardcoded).
i'm making a pr that hardcodes all the links now, so there's less future mystery around that.
i'll put this live in a few mins and these adjustments should be live.

[VeraZab]

the right footer info is on the site now! thanks @michaelbabyn for realizing it. don't know what happened, but its hardcoded now, so it should all be easier to maintain.

[jdamiba]

@michaelbabyn Here is a screenshot of the footer, synced with plotly-next (current state of this PR):

[michaelbabyn]

This looks good, @jdamiba. 💃