fixed mobile nav colors

only display the toggle setting in development env for now

it is now only shown as active when on the dashbord/projects controller

[ci skip]

also added the help link back into the nav bar

made the title a link back to the dashboard

[ci skip]

[ci skip]

Start of the new navigation by redesigning just the top navigation menu.
This is only shown when a cookie is set.

Part of #32794

Disable environment list polling as it breaks deployboard

See merge request !12347

Remove registry image delete button if user cant delete it

Closes #33837

See merge request !12317

Replace 'create.feature' spinach test with an rspec analog

See merge request !12343

Add index for head pipeline

See merge request !12273

Replace invalid chars while seeding environments

Closes #30855

See merge request !12267

Fix edit button for deploy keys available from other projects

Closes #33878

See merge request !12301

Fix broken relative URL in prometheus docs

Closes #34050

See merge request !12340

[ci skip]

Remove vue from main.bundle.js

Closes #34017

See merge request !12327

add printing_merge_request_link_enabled to API

See merge request !12240

Pass Gitaly token on Ruby gRPC requests

See merge request !12228

Remove unused attr_accessor from Gitlab::Git::Commit

See merge request !12311

Merge branch '33502-make-gitlab-project-issue-description-templates-less-specific-with-the-project-they-reference' into 'master'

Mention both CE and EE issue trackers in description templates

Closes #33502

See merge request !12326

Change references from ApplicationSetting to ::ApplicationSetting to make autoload happier

Closes #34047

See merge request !12331

Resolve "Cross-reference icon no longer visible in normal sidebar"

Closes #33942

See merge request !12299

Resolve "Protected branch dropdowns cut-off in Repository Settings page"

Closes #33693

See merge request !12247

Bulk edit scroll fix

Closes #33870

See merge request !12219

Closes #34047

Remove vue from main.bundle.js file being loaded through `app/assets/javascripts/merge_request_tabs.js`

[skip ci]