Top count displays how many resolved discussions

Fixed issue with resolve buttons always being visible - even when not logged in

Store that manages the state of each button

Add links to the real markdown.md file for all GFM examples

## What does this MR do?

Add links to the real markdown.md file for all GFM examples since they will not render correctly on docs.gitlab.com.

We already have a note https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5440, but better be explicit.

See merge request !5458

Fix bug where replies to commit notes displayed in the MR discussion tab wouldn'…

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/20157

See merge request !5446

Add gitlab-workhorse version to admin dashboard

## What does this MR do?
Add gitlab-workhorse version to admin dashboard.

## What are the relevant issue numbers?
Closes #15418 

## Screenshot
![Zrzut_ekranu_2016-07-20_o_23.20.55](/uploads/ba6761e2145d903ac87bc7198bc8b182/Zrzut_ekranu_2016-07-20_o_23.20.55.png)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [x] Add test - show Gitlab Workhorse version on Admin Dashboard
  - [x] All builds are passing
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)

cc @ubudzisz @yorickpeterse @grzesiek [@chastell](https://github.com/chastell) [@tomash](https://github.com/tomash)

See merge request !5321

Fix bug where replies to commit notes displayed in the MR discussion tab wouldn't show up on the commit page

Improve project rename log messages for better debugging

This should help diagnose issues such as #20178.

See merge request !5450

Add light border to rounded avatars

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/20128

To make it clear that avatar is cropped by border radius

cc @hazelyang 

See merge request !5429

Helping to diagnose #20178

Test for showing GitLab Workhorse version on Admin Dashboard

Refactoring

Add note to say GFM doesn't work on documentation website



See merge request !5440