fix: Use internal browser for help instead of broken external one

Change Capella settings to force help to be shown using the internal browser. There was
discussion about exposing help as outside the container as well, but this is probably not worth the
effort.

Closes #301 #159 DSD-DBS/capella-collab-manager#753 DSD-DBS/capella-collab-manager#576

capella/setup/setup_workspace.py

@@ -74,4 +74,11 @@ def _set_git_merge_mode() -> None:
         f"{WORKSPACE_DIR}/git",
     )
 
+    # Force Help to built-in browsr
+    _replace_config(
+        ECLIPSE_SETTINGS_BASE_PATH / "org.eclipse.help.base.prefs",
+        "always_external_browser",
+        "false",
+    )
+
     _set_git_merge_mode()