feat: Docusaurus ESLint plugin to enforce best Docusaurus practices (#7206)

* feat: add eslint plugin

* refactor

* add tests

* fixups!

* fix(no-dynamic-i18n-messages): make translate() recognize template literals

* refactor: rename rule no-dynamic-i18n-messages --> string-literal-i18n-messages

* feat: add ignoreStrings option and refactor

* docs: migrate docs to /docs/api/plugins

* docs: fix anchor links in README.md

* fix: add some ignored strings

* docs: update eslint-plugin docs

* fix: update README link

* docs: various updates

- Reorder sidebar entries
- Fix title size
- Use Markdown file paths
- Simplify relative links

* address reviews

* wording polish

* add npmignore

* fix all internal warnings

* doc improvements

* fix test

Co-authored-by: Joshua Chen <sidachen2003@gmail.com>

website/docs/api/misc/eslint-plugin/no-untranslated-text.md

@@ -0,0 +1,48 @@
+---
+slug: '/api/misc/@docusaurus/eslint-plugin/no-untranslated-text'
+---
+
+# no-untranslated-text
+
+Enforce text labels in JSX to be wrapped by translate calls.
+
+When the [i18n feature](../../../i18n/i18n-introduction.md) is used, this rule ensures that all labels appearing on the website are translatable, so no string accidentally slips through untranslated.
+
+## Rule Details {#details}
+
+Examples of **incorrect** code for this rule:
+
+```js
+// Hello World is not translated
+<Component>Hello World</Component>
+```
+
+Examples of **correct** code for this rule:
+
+```js
+// Hello World is translated
+<Component>
+  <Translate>Hello World</Translate>
+</Component>
+```
+
+## Rule Configuration {#configuration}
+
+Accepted fields:
+
+<APITable>
+
+| Option | Type | Default | Description |
+| --- | --- | --- | --- |
+| `ignoreStrings` | `string[]` | `[]` | Text labels that only contain strings in this list will not be reported. |
+
+</APITable>
+
+## When Not To Use It {#when-not-to-use}
+
+If you're not using the [i18n feature](../../../i18n/i18n-introduction.md), you can disable this rule. You can also disable this rule where the text is not supposed to be translated.
+
+## Further Reading {#further-reading}
+
+- https://docusaurus.io/docs/docusaurus-core#translate
+- https://docusaurus.io/docs/docusaurus-core#translate-imperative