Replace default branch with main

[gtsiolis]

I think this has caused more confusion than help, but is there any real value from keeping develop as the default branch?

Cc @henit-chobisa @Palanikannan1437

Cc @mads-hartmann because we recently chatted about this

[Palanikannan1437]

develop basically is the branch that's synced with the beta organisation in Raycast.

main basically is the branch that's synced with the extension in the Raycast store that's publicly available.

We've kept develop as the default such that folks who want to check out the latest feature could discover the code to be able to do that.

The ones coming from the actual Raycast extension in the store would probably anyways see the code in Raycast's "extension" monorepo and mostly never land up to this Repository until they click on "try as a beta tester"