Remove CHANGELOG files

[peterschewe]

We can remove the CHANGELOG files as the usage is not currently kept consistent and up to date. The changes are also logged in the GitHub release notes.

TBD: We could keep a CHANGELOG template without demo content (e.g. https://keepachangelog.com/en/1.0.0/). However, I rarely see it used in our projects. What do you think @bezoerb?

Todos:

• Delete templates/app/CHANGELOG.md
• Delete templates/theme-default/CHANGELOG.md

[bezoerb]

Or we start using it even if it is not actively requested by the client

[peterschewe]

Yes, we can try it.

I have also misunderstood the structure of our changelogs. We use the following to track the changes of the individual packages:

• ./CHANGELOG.md
• ./packages/contentful-migrations/CHANGELOG.md
• ./packages/create-wekit-app/CHANGELOG.md
• ./templates/app/CHANGELOG.md
• ./templates/theme-default/CHANGELOG.md

So we could remove the specific WEKit changes in templates/app/CHANGELOG.md and keep it as a changelog template for the project scaffold. Not entirely consistent with the others. 🤔