chore(plus/updates): add metrics for expand/collapse/pagination (mdn#…

…7841)

Adds three metrics:
- When a feature support event is expanded.
- When a feature support event is collapsed.
- When the page is changed (e.g. 0 -> 1).

chore(plus-menu): add Updates link (mdn#7839)

chore(macros/LearnSidebar): translate Client-side_tooling_overview in…

… Japanese (mdn#7407)

feat(plus/updates): add basic frontend (mdn#7814)

This new feature allows users to browse changes in the browser 
compatibility data. Changes are grouped by browser release,
and each entry refers to feature support being added or removed 
in that release. Every entry has an indicator of how many engines 
(Blink, Gecko, WebKit) support the feature. Expanding the entry 
reveals the full browser compatibility table.

While this basic version of the feature is available to everyone,
including unauthenticated users, advanced features like watching
or saving a page from here is reserved for MDN Plus users.

Co-authored-by: Claas Augner <[email protected]>

fix(macros/JSRef): use page type instead of tags (mdn#7808)

* Use page type instead of tags in JSRef

* Fix

* Formatting

* Refactor: remove isObj variable

fix(client/config): migrate to setupMiddlewares option (mdn#7671)

This was necessary, as webpack-dev-server v4.7.0 deprecated the
`onBeforeSetupMiddleware` and `onAfterSetupMiddleware` options.

See: https://github.com/webpack/webpack-dev-server/releases/tag/v4.7.0

feat(kumascript): expose frontmatter status on page object (mdn#7801)

chore(kumascript): refactor and remove unused apis (mdn#7812)

1. Removes from the kumascript global scope:
  - kuma.*
  - page.{subpages,subpagesFlatten}
  - string.*
  - wiki.uri [inlining calls]
2. Moves {kuma => mdn}.htmlEscape.
3. Inlines the deprecated `minversionGeneric` macro.
4. Fixes an unnecessarily async function in the `CSSInfo` macro.

chore(spas): update featured articles (mdn#7816)

feat(tool): add macro-usage-report command (mdn#7087)

This new tool allows us to easily get an overview of our macros.
It is possible to filter by deprecated or unused macros, and there
are two formats, a Markdown table (default) and JSON.

However, the command requires `rg` to be installed locally.
See: https://github.com/BurntSushi/ripgrep

Co-authored-by: Schalk Neethling <[email protected]>