Feature request: Add a table of content for documentation pages

[What-is-water93]

Some registry pages containing documentation for provider or resources are pretty long. The terraform registry has a "On this page" Section in the right sidebar, containing the top level headings of the page to quickly navigate to the information you need:

A similar (or more detailed) table of content in the tofu registry would be useful to quickly jump to the relevant part of the documentation without having to scroll through a lot of information.

[yottta]

Hello and thank you for this issue! The core team regularly reviews new issues and discusses them, but this can take a little time. Please bear with us while we get to your issue. If you're interested, the contribution guide has a section about the decision-making process.

[gacardinal]

Hey there!

Should we decide to move forward with implementing this, I'd ba happy to work on it!

I'm still just getting acquainted with the project but it seems like it could be a nice first issue to work on, lmk!

[Yantrio]

I've been re-working this view completely lately and I think I should roll it in as part of that work (Found here: #338)

[Yantrio]

I've quickly added this to #338. Let me know what you think :) https://cleanup-design.registry-ui-dxi.pages.dev/provider/hashicorp/aws/latest/docs/resources/instance

[What-is-water93]

Looks great! I like that it also has subheading, and not just the top level sections.