Rename Git branches

[paullatzelsperger]

WHAT

We require the following renaming of Git branches:

• main -> releases (will track all the releases)
• develop -> main (will be our default branch)
• delete develop

WHY

The renaming is necessary to comply with TractusX Release Guidelines, but also being able to leverage the benefits of GitFlow, as well as convenience features of GitHub itself (e.g. automatic PR->issue linking, default branch checkouts, etc.).

The decision is outlined in this decision record.

IMPORTANT

• All open PRs may need to be manually re-targeted before develop is deleted!
• Do this at a time where little disruption is expected, e.g. during night time or a weekend.

[paullatzelsperger]

maybe we could solve #216 in the course of this issue as well.