docs: update structure and create links between pages (#1611)

* docs: rework files structure

* rewrite documentation entrypoint

* update category files and use yml

* add manuals entry page

* update admin-manual titles and page order

* create releases sections

* move ssl configuration to reverse proxy

* docs: update website vars and links

* update release note codeblock syntax key

* resurect troubleshooting guide

* Update freeipa custom auth documentation

* add notice about the state of the documentation

* update the backup documentation

* tmp: allow to deploy the website for preview

* Don't use require.resolve for plugins

* Update the main page link dest

* update development environment title

* rewrite the install/upgrade/migrate as guides

* update website docs sections links

* Fix urls

* move release note to documentation

* move home links to vars files

* tmp: update deploy url

* add react to tsconfig to handle jsx linting

* fix: replace absolute url to relative path to files

* tmp: allow CI Website dpeloy on working branch

* Update release note title

* use default syntax highlighting theme

* update the troubleshooting guide

* Wording

* use CodeBlock components

* Better prose

* remove api_client config section

* fix prose errors

* update import prefix for vars file

* reroder docs manuals links

* use sentence capitalization for page titles

* Wording

* missing word

* Update note about syslog log file

* wording

docs/developer-manual/README.md

@@ -0,0 +1,13 @@
+---
+title: Developer manual
+---
+
+Welcome to the **LibreTime developer manual**, you should find guides to integrate LibreTime and tools to improve and contribute to LibreTime.
+
+## Integrate LibreTime
+
+- :construction: Work in progress
+
+## Improve and contribute to LibreTime
+
+- :construction: Work in progress