Wiki auto-generated TOC is including _Sidebar headers incorrectly positioned

[tepozoa]

Description

The new 1.17.x+ Wiki auto-generated TOC is including the headers from _Sidebar.md in a way that's incorrect (or, we should not add them at all?). We could:

1. Not include _Sidebar.md elements in the auto-generated TOC, or
2. Include them, but make a new major header in that box named "Sidebar" (same UI as the TOC) so that the included header elements make sense

It presents worse when the Sidebar is using ## or smaller headers, so they're appearing incorrectly indented under an actual TOC entry.

Gitea Version

https://try.gitea.io

Can you reproduce the bug on the Gitea demo site?

Yes

Log Gist

No response

Screenshots

Demo of issue: https://try.gitea.io/tepozoa/test/wiki/Lorem-Markdownum

Look to "Sidebar Header" and "Sidebar Footer" at the bottom of the TOC, which appear incorrectly as children of "Altissimus clara" which is part of the content on the left.

Git Version

No response

Operating System

No response

How are you running Gitea?

https://try.gitea.io

Database

No response

[tepozoa]

(not a programmer) If I understand the flow in https://github.com/go-gitea/gitea/blob/main/routers/web/repo/wiki.go in a basic sense, it might be as "simple" as moving ctx.Data["toc"] = rctx.TableOfContents from below isSideBar and isFooter conditionals above it, and right below the ctx.Data["EscapeStatus"], ctx.Data["content"], err = renderFn(data) render of the main content so that the TOC renders before the Sidebar/Footer are added to the context? Maybe?