chore: Split build-and-deploy job and run build on all branches

[cghsystems]

The Kratix-docs CircleCI job is setup to run the build & deploy stages in a single job and the job is only configured to run on the main branch. This results in poor development feedback loops as yarn build is not run in CI until deploy time on main. yarn build should run on all development branches as it gives development time verifications of things like broken links and broken dependencies.

Tasks are:

• split build & deploy into two jobs
• run the new build job on all branches
• The deploy should still only run on main)

[kirederik]

instead of splitting, consider adding a job that runs on all branches but main that just runs the yarn build step, while the existing ci remains as is; i think the overall pipeline may be simpler this way 🤔