Bump deps, add ci (lint, formatting checks) and fix linting and formatting issues

[sebdanielsson]

Changes

To avoid breaking changes in the future and enable automatic dependency updates, I've bumped the dependencies and added many checks that will run on every PR. This way, most regressions can be caught before merging. I've also fixed many linting and formatting issues that were already present.

Changes:

• Bump dependancies and install lint and format packages
• Remove unused components and pages
• Switch to ts and ESM configs
• Run prettier
• Add truncate to fix Docusaurus warning
• Fix broken link warning
• Change from Twitter to X
• Add stylelint config
• Add eslint flat config
• Apply stylelint fixes
• Use node-version file to set the version once
• Add CI to check PR:s before merging

Demo

CI Workflow run (new)

https://github.com/sebdanielsson/docs/actions/runs/11042997848/job/30676452588

Deploy workflow (same as before)

https://github.com/sebdanielsson/docs/actions/runs/11042977631/job/30676442768

[tjbck]

LGTM, Thanks!