Only show context relevant links (Personal or Administration settings) in sidebar

Is your feature request related to a problem? Please describe.

As an admin of a Nextcloud instance, I am always slightly disoriented when accessing Personal Settings and especially so when accessing Administration Settings section. The main issues are:

1. The top 50% of my sidebar (where my eye lands first) is Personal Settings links- which have nothing to do with administration of the instance.

2. There are two sidebar menu items called Sharing which is slightly confusing.

3. The current approach limits how many relevant menu items are able to be displayed on the sidebar as number of apps scales. This increases cognitive load.

Describe the solution you'd like

Split up the two types of settings semantically by having sidebar links which only pertain to that area.

The Administration settings should look like this:

The Personal settings would be absent of Administration links below.

Additional context

Allowing Administration settings to have it's down dedicated sidebar works nicely with #40160 in terms of information architecture and displaying relevant information to the user.