Use rems instead of px to set body font-size

Closes #61640

See merge request gitlab-org/gitlab-ce!28544

Add documentation about AWS ELB not supporting web sockets

See merge request gitlab-org/gitlab-ce!28030

Add CI quickstart updates

See merge request gitlab-org/gitlab-ce!24702

Document the Admin Area's *Gitaly Servers* page

See merge request gitlab-org/gitlab-ce!28987

VERSION file should be 12.0, not 11.12

See merge request gitlab-org/gitlab-ce!29092

Edited signup restrictions for SSOT guidelines

See merge request gitlab-org/gitlab-ce!29049

Fix markdown parsing for doc page

See merge request gitlab-org/gitlab-ce!29056

Snippets API doc fixes: content->code; visibility is required

See merge request gitlab-org/gitlab-ce!28571

Currently, the field used to fill the contents is called "code".
Also "visibility" is now required.

Fix project settings not being able to update

Closes #62708

See merge request gitlab-org/gitlab-ce!29097

Edit *Instance template repository* for SSOT epic

See merge request gitlab-org/gitlab-ce!29032

Use /bin/herokuish in Auto DevOps docs examples

See merge request gitlab-org/gitlab-ce!28974

CE Backport of !13803: "Fix all `no-implicit-coercion` ESLint violations

See merge request gitlab-org/gitlab-ce!29007

This commit is the result of running `yarn eslint --fix` after enabling
the `no-implicit-coercion` ESLint rule.  This rule has been added to
our ESLint config here:

https://gitlab.com/gitlab-org/gitlab-eslint-config/merge_requests/14

Backporting EE fix

Closes #61264

See merge request gitlab-org/gitlab-ce!29004

Previously import_url would always be present in the update parameters,
which would cause the validation to fail. We now only include this
parameter only if there is URL given.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/62708

Move boardsStore.moving to BoardList component

See merge request gitlab-org/gitlab-ce!29076

Clarify "support" to mean GitLab.com integration

See merge request gitlab-org/gitlab-ce!29091

This was apparently causing Gitlab.version_info to return the wrong
values, causing the wrong images to be loaded via CI_SERVER_VERSION.

Log out in after all hook

See merge request gitlab-org/gitlab-ce!28969

Add activerecord-explain-analyze gem

See merge request gitlab-org/gitlab-ce!29051

- Use rems instead of px to set default font-size
    This allows users to change font sizes in their browser and it will
    affect the view in our application

Backport EE MR

See merge request gitlab-org/gitlab-ce!29066

This gem allows you to get the `EXPLAIN ANALYZE` query plan, directly
from the Rails console.

The gem is installed with `require: false`, but if it was loaded on
launch, this would be it's memory load:

```
TOP: 145.3086 MiB
  rails/all: 22.4844 MiB
  ...
  activerecord-explain-analyze: 2.9648 MiB
    active_record/connection_adapters/postgresql_adapter: 2.9648 MiB
      pg: 2.9648 MiB
        pg_ext: 2.9648 MiB
  ...
```

Update architecture.md to fix typo in GitLabMonito -> GitLabMonitor

See merge request gitlab-org/gitlab-ce!28955

Reconcile CE and EE differences in members/_member.html.haml

See merge request gitlab-org/gitlab-ce!29021

Stop two-step rebase from hanging when errors occur

Closes #62353

See merge request gitlab-org/gitlab-ce!29068

This change makes sure Gitaly includes a fix to make rebase work again
properly.

Part of: https://gitlab.com/gitlab-org/gitlab-ce/issues/62353

Reject slug+uri concat if slug is deemed unsafe

See merge request gitlab/gitlabhq!3108

Persistent XSS in note objects CE

See merge request gitlab/gitlabhq!3075