What if we used the titles in the collapsible boxes’ summaries, like so? (I saw I could edit the post, but thought it would create confusion with replies and more edits.)
Example:
Getting Started With The Forum
Discourse New User Guide 
This forum uses Discourse software
Hands-on practical courses to learn Discourse commands
Two courses taught by the Discourse discobot
How to help us help you
How to ask a good question
How to help us help them
How to give a good answer
Tips on community searching
Looking for answers and duplicate topics in the forum
Custom search links for frequent searchers
Shortcuts to save repeatedly typing the same thing into the search toolbar
Formatting YAML in forum posts
Using the preformatted text tool
Adding links to forum posts
Preview blocks and linking to particular posts
Getting help in languages other than English
This is an English language forum, but there are others
How to share automations and scripts
Making it easy for others to read and copy them
Getting Started With HA
Awesome Home Assistant
An overview
Introduction to Home Assistant and the official documentation
A personal view
Twenty things I wish I knew when I started with Home Assistant
And another one…
Basic common Home Assistant tasks 
Tips on searching the docs
Using the search box
Index to Home Assistant documentation
Unofficial A-Z index
Integrations, add-ons and custom integrations
How they differ, what they do
Disaster recovery planning
What could possibly go wrong?
The downside is that one loses the heading formatting.