Docs/3801/gh pages overhaul

[ChristianHuehn]

Make GH Pages more inviting

Please read the CONTRIBUTING.md before opening a PR.

{Issue/Closes}: #3801

Description

To make our ghpages and our readme more inviting we had to change a couple of things:

• Change our landing gh-page
• Add MW to our footer
• Replace audits with software health check
• Remove unused pages, like Timeline
• Add a service offering page

Update some of the readme file on the github landing page

Definition of Done

A PR is only ready for merge once all the following acceptance criteria are fulfilled:

• Changes have been manually tested
• All TODOs related to this PR have been closed
• There are automated tests for newly written code and bug fixes
• All bugs discovered while working on this PR have been submitted as issues (if not already an open issue)
• Documentation (GH-pages, analysis/visualization READMEs, parser READMEs, --help, etc.) has been updated (almost always necessary except for bug fixes)
• CHANGELOG.md has been updated

Screenshots or gifs

[sonarcloud]

Quality Gate passed for 'CodeCharta Visualization'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[sonarcloud]

Quality Gate passed for 'CodeCharta Analysis'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud