docs(dev): reorganize and clean up technical documentation

docs/Developer Guide/Developer Guide/Documentation/Documentation references in th.md

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+# Documentation references in the application
+## Hard-coded links
+
+Hard-coded links are present throughout the application, either in dialogs or in the source code as comments.
+
+You can identify these links by searching for:
+
+```
+https://triliumnext.github.io/Docs/Wiki/
+```
+
+## Help buttons
+
+There is a pattern of “?” buttons throughout the application which make use of the `data-help-page` attribute. Whenever these buttons are pressed, the user is redirected to the corresponding wiki page by prepending the wiki root URL to the `data-help-page` attribute.
+
+### Deprecated `help-page` attribute
+
+Since the current wiki has a different structure than the original, for example to link to [https://github.com/TriliumNext/Docs/blob/main/Wiki/tree-concepts.md](https://github.com/TriliumNext/Docs/blob/main/Wiki/tree-concepts.md) the `data-help-page` attribute must be set to `tree-concepts.md`.
+
+For links to headings, simply add the heading after the `.md`: `tree-concepts.md#prefix`
+
+You can identify those by looking for:
+
+*   `.attr("data-help-page"`
+*   `data-help-page="`
+
+### More modern `data-in-app-help` attribute
+
+Instead of opening in a web browser, this opens the help directly in the application in a split view. This is handled via the `data-in-app-help` attribute, where the value is the note ID of the help page without the `_help_` prefix.
+
+### React
+
+Use the `HelpButton` component in the same fashion as the `data-in-app-help` attribute.