Move local build instructions to build doc

doc/build/README.md

@@ -130,6 +130,11 @@ repository should contain `buildfrombranch:my-feature`.
 Similarly, you can do the same for `GITLAB_WORKHORSE_VERSION` and so on.
+## Building locally
+
+To build a package locally, set `use_s3_caching false` in `omnibus.rb`. Then
+build with `make build`.
+
 ### Note for GitLab Inc. developers
 If you are a member of the GitLab Inc. team, you will have access to the build

doc/development/README.md

@@ -29,7 +29,5 @@ repository, for example:
 sudo ln -s ~/omnibus-gitlab/files/gitlab-cookbooks/gitlab /opt/gitlab/embedded/cookbooks/gitlab
 ```
-Then set `use_s3_caching false` in `omnibus.rb`.
-
 Now you can do the changes in the omnibus-gitlab repository, try the changes
-right away with `make build`, and contribute back to omnibus-gitlab.
+right away, and contribute back to omnibus-gitlab.