build: remove scripts and documentation about individual usage of RBE (…

…angular#46515)

As there is little to no usage of RBE by individuals and we don't actively ensure
that the process and permissions are working for individuals the documentation is
best removed from the repo.

PR Close angular#46515

docs/DEVELOPER.md

@@ -231,12 +231,11 @@ It will automatically recognize `*.bazel` and `*.bzl` files.
 
 
 ### Remote Build Execution and Remote Caching
-Bazel builds in the Angular repository use a shared cache.  When a build occurs a hash of the inputs is computed
-and checked against available outputs in the shared cache.  If an output is found, it is used as the output for the
+Bazel builds in the Angular repository use a shared cache. When a build occurs a hash of the inputs is computed
+and checked against available outputs in the shared cache. If an output is found, it is used as the output for the
 build action rather than performing the build locally.
 
-> Remote Build Execution requires authentication as a google.com or angular.io account.
+> Remote Build Execution requires authentication as a google.com account.
 
 #### --config=remote flag
-The `--config=remote` flag can be added to enable remote execution of builds.  This flag can be added to
-the `.bazelrc.user` file using the script at `scripts/local-dev/setup-rbe.sh`.
+The `--config=remote` flag can be added to enable remote execution of builds.