[next] fix(docs): bring back NcAppSidebar in docs

[raimund-schluessler]

☑️ Resolves

• This brings back the NcAppSidebar example in the docs and adjusts the style to actually show NcContent.
• It also fixes an issue in the styleguide with Teleport as the #skip-actions element was not present.

[susnux]

Adjust the styleguide to have a <div id="#skip-actions"> element somewhere (preferred, but I don't know how).

I have not looked into it, but maybe just add this to the examples that use NcContent?
Otherwise maybe (dirty!) inject it using global.requires.js.

[raimund-schluessler]

Adjust the styleguide to have a <div id="#skip-actions"> element somewhere (preferred, but I don't know how).

I have not looked into it, but maybe just add this to the examples that use NcContent? Otherwise maybe (dirty!) inject it using global.requires.js.

That is a great idea, thanks! I added an element and it makes the styleguide work. The skip actions is even functional. 👍

[susnux]

works but styles are broken (like before)

[raimund-schluessler]

Could we merge this and release 9.0.0-alpha.1? Then I could proceed and merge the Tasks vue 3 migration nextcloud/tasks#1971 as well.