Clean up/restyle "edit in github"/"request changes" links

[sanscontext]

What's wrong? Describe the what you're seeing

In #517 I got some links working that will make a huge difference to the visibility of the OSS project, once we're able to open the repo up to everyone. However, they're functional, not pretty at all.

• This shouldn't get touched until we're ready to, or have already opened the repo to the public.

Problem location

Suggestions for a fix

These should be restyled by someone at Tonik who can make them look prettier.
Specifically, they could use:

• an icon for each (the original Docker ones had a pencil, and a checkmark)
  
• better spacing from the TOC 😅
• to be added to/incorporated into the feedback tools (👍/ 👎 ) so they can be disabled by the hide-feedback frontmatter.

[dredecki]

I've prepared two variants, with and without icons. https://www.figma.com/file/NiNCSnUj5XVyQqc3AUEvfX/Docs?node-id=48%3A0

[sanscontext]

I definitely like the version with the icons - without them, it just looks like more text on the page. The text color looks a little light though - will they get darker/brighter on hover?

[dredecki]

Provided two additional options, one in green and another one similar to other elements in sidebar. What do you think?

https://www.figma.com/file/NiNCSnUj5XVyQqc3AUEvfX/Docs?node-id=48%3A0

[sanscontext]

I like the version with the icons in the dark grey best. :)

One question - we're adding a bunch of stuff/affordances to the right-nav below the TOC, which can get pretty long. Can we re-group those above the TOC? (Other places call grouping these things together a "toolbelt" 👷 )

[dredecki]

Added two more options to Figma — https://www.figma.com/file/NiNCSnUj5XVyQqc3AUEvfX/Docs?node-id=48%3A0

For me, we should go with edit, toc and feedback at the bottom. What do you think?

[sanscontext]

I actually prefer having the TOC as the last thing in the right-nav, since it can be really long - unless you have a different idea of how to show them for when the TOC is long? (Thinking about this page specifically: https://segment.com/docs/connections/sources/catalog/libraries/website/javascript/ )

I want to make sure the feedback and other tools are visible as much as possible. At Docker we just devoted the top right corner to these tools:

[dredecki]

Yea, make sense! I've adjusted the spacing a bit. https://www.figma.com/file/NiNCSnUj5XVyQqc3AUEvfX/Docs?node-id=162%3A471

Should we take care of dev part of this? Are you ready to open your docs?

[sanscontext]

Love the new layout! That's perfect.

Re: timing: We're targeting end of March, so we're not ready just yet. (There are some dependencies on other teams.)

But if we make this change last among my Tonik-requests, we should be able to just hold back the branch un-merged until we're ready to go. :)