chore: remove picture references to user-images

[johanneskueffner]

Description

• add pictures to docs static
• link pictures from docs static
• add picture guidlines to contributing guide

Why

Cleanup

Issue

Link to Github issue.

Checklist

• I have followed the contributing guidelines
• I have added copyright and license headers, footers (for .md files) or files (for images)
• I have performed a self-review of my own changes

[evegufy]

Looks good so far!
Just have a look at my comment

And please also add the following as the issue requests:
"Please also enhance the 'How to contribute' guide with a description about how to manage images (upload to static/docs, create license file, link in the documentation...)."

And correct the PR title, I think you wanted to write user-images instead of catenax-ng.

[jjeroch]

Hi, before merging we need to validate what we merge first - in parallel following prs got created and might impact this pr

• docs: add autosetup details #245
• docs(developer): update registration flow #246
• fix(company roles): standard library title and description #244

[evegufy]

could you please adjust the cases of user-images in the following files:
https://github.com/catenax-ng/tx-portal-assets/blob/chore/remove-user-images/docs/developer/01.%20Onboarding/03.%20Registration%20Approval/03.%20Registration%20Approval%20Process.md
https://github.com/catenax-ng/tx-portal-assets/blob/chore/remove-user-images/docs/user/01.%20Onboarding/03.%20Registration%20Approval/03.%20Registration%20Approval%20Process.md

[sonarcloud]

Quality Gate passed

Issues
0 New issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[evegufy]

Hi, before merging we need to validate what we merge first - in parallel following prs got created and might impact this pr

• docs: autosetup details #245
• docs(developer): registration flow documentation update #246
• fix(company roles): standard library title and description #244

I'll merge this PR first and then solve potential conflicts and do the necessary adjustments for the mentioned PRs.