Add markdownlint formatting checks

[mgovers]

• Add markdownlint to pre-commit
  • Verify that it works
• Add markdownlint to github actions check
  • Verify that it works:
    • Failing commit: https://github.com/PowerGridModel/power-grid-model/actions/runs/14594684246/job/40937677769?pr=963#step:11:18
    • Passing commit: https://github.com/PowerGridModel/power-grid-model/actions/runs/14594820751/job/40938150189?pr=963#step:11:1
• Reformat using pre-commit
• Disable any linting errors that are triggered

[sonarqubecloud]

Quality Gate passed

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 SonarQube Cloud

[TonyXiang8787]

Has this been discussed to enable markdown linter in the repository?

I feel this is a more project governance decision.

[mgovers]

Has this been discussed to enable markdown linter in the repository?

I feel this is a more project governance decision.

Awaiting approval from the team (do-not-merge label)

[figueroa1395]

While I totally support the addition of markdown lint, maybe we should visit all the options with the team, as we should probably have a consensus on what to enable/disable. Besides that, great change.

[figueroa1395]

While I totally support the addition of markdown lint, maybe we should visit all the options with the team, as we should probably have a consensus on what to enable/disable. Besides that, great change.

Given #964, I have resolved all the comments I had. Now I see that there is a follow up to things that can't be addressed immediately and need further changes/discussion. Hereby I give my approval :)

[mgovers]

Has this been discussed to enable markdown linter in the repository?
I feel this is a more project governance decision.

Awaiting approval from the team (do-not-merge label)

Team has approved