chore: incorporate small findings from qgate review

[tom-rm-meyer-ISST]

Description

During Review of the QGate #127, a few things were that small that I directly incorporated them.

Why

Compliance to TRG is needed. Beside the issues listed, I added the QGate check workflow so that you automate a few checks a little :)

Issue

Following issues are resolved:

• 140 -> link to docs

• 141 -> added one line for installation

• 144 -> added prerequisites

Checklist

Please delete options that are not relevant.

• [x] I have followed the contributing guidelines
• [x] I have performed IP checks for added or updated 3rd party libraries
• [x] I have created and linked IP issues or requested their creation by a committer
• [x] I have performed a self-review of my own code
• [x] I have successfully tested my changes locally
• [x] I have added tests that prove my changes work
• [x] I have checked that new and existing tests pass locally with my changes
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have added copyright and license headers, footers (for .md files) or files (for images)