Revert "website: latest migration to new structure" (#11634)

Revert "website: latest migration to new structure (#11522)"

This reverts commit 9a89a5f94b.

website/developer-docs/translation.md

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+---
+title: Translations
+---
+
+Translation in authentik is done in two places. Most of the text is defined in the frontend in `web/`, and a subset of messages is defined in the backend.
+
+The frontend uses [@lit/localize](https://lit.dev/docs/localization/overview/), and the backend uses the built-in django translation tools.
+
+:::info
+Please review the [Writing documentation](./docs/writing-documentation) guidelines as they apply to documentation too.
+:::
+
+## Online translation
+
+To simplify translation you can use https://www.transifex.com/authentik/authentik, which has no local requirements.
+
+## Local translation
+
+### Prerequisites
+
+-   Node (any recent version should work, we use 16.x to build)
+-   Make (again, any recent version should work)
+-   Docker
+
+Run `npm i` in the `/web` folder to install all dependencies.
+
+Ensure the language code is in the `lit-localize.json` file in `web/`:
+
+```json
+    // [...]
+    "targetLocales": [
+        "en",
+        "pseudo-LOCALE",
+        "a-new-locale"
+        // [...]
+    ],
+    // [...]
+```
+
+Afterwards, run `make web-i18n-extract` to generate a base .xlf file.
+
+The .xlf files can be edited by any text editor, or using a tool such as [POEdit](https://poedit.net/).
+
+To see the change, run `make web-watch` in the root directory of the repository.