docs: add rfc section

[tac0turtle]

Description

This pr adds an RFC section for items that may not need adrs right away or to capture ongoing conversations

---

Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.

I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• followed the guidelines for building modules
• included the necessary unit and integration tests
• added a changelog entry to CHANGELOG.md
• included comments for documenting Go code
• updated the relevant documentation or specification
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

Reviewers Checklist

All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed the correct type prefix in the PR title
• confirmed ! in the type prefix if API or client breaking change
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[julienrbrt]

---
sidebar_position: 1
---

?

[tac0turtle]

we dont have this on the adr section, ideally we tell it to not show the template files like we do today

[julienrbrt]

Yeah it is fine without it too. It was only required for the README to show properly I think.

[julienrbrt]

Just seen that it does not actually shows in the docs.
This is because it is in docs/rfc, which is clearer when browsing the GH repo, but at the docs building we need to copy that in docs/docs.

[julienrbrt]

My bad @tac0turtle , it was sidebar_position: 1 needed here.

As it is a main section, setting 0 makes it as important as the doc homepage readme :/