web: Fix inline documentation rendering (#13379)

web: Fix issues surrounding markdown rendering.

- Fix issue where Mermaid diagrams do not render.
- Fix link colors in dark mode.
- Fix anchored links triggering router.
- Fix issue where links occasionally link to missing page.

website/docs/add-secure-apps/providers/oauth2/index.mdx

@@ -39,7 +39,7 @@ sequenceDiagram
     user->>op: User authentication & authorization occurs
     op->>rp: Redirect back to the RP with an authorization code
 
-    rect rgb(255, 255, 191)
+    rect
 
         rp->>op: Exchange authorization code
         op->>rp: RP receives Access token (optionally Refresh Token)
@@ -138,6 +138,7 @@ By default, every user that has access to an application can request any of the
 
 ```python
 # There are additional fields set in the context, use `ak_logger.debug(request.context)` to see them.
+
 if "my-admin-scope" in request.context["oauth_scopes"]:
     return ak_is_group_member(request.user, name="my-admin-group")
 return True