In this PR, we have some changes for the build guides and deploy tools.
Including:

- Rename `readmes/*` -> `deploy/build/*`
- Rename `hooks/*` -> `src/tools/hooks/*`
- Move `python-dependencies.txt` to the top dir
- Move `README.Conda.md` out from the main repo to the
  `cloudberrydb/cloudberrydb-site` repo because it's for the data
  analytics guide, not how to build a Cloudberry Database.

Note that we have not verified the files in `deploy/vagrant`,
`deploy/docker`, and `deploy/k8s`. We cannot make sure it can run
successfully. We will do that in the following months.