Remove dev and main branch from workflows. (#404)

* Remove `dev` and `main` branch from workflows.

Update links in documentation.

Signed-off-by: David Galiffi <David.Galiffi@amd.com>

* `amd-staging` -> `amd-mainline` in docs

Signed-off-by: Peter Jun Park <peter.park@amd.com>

---------

Signed-off-by: David Galiffi <David.Galiffi@amd.com>
Signed-off-by: Peter Jun Park <peter.park@amd.com>
Co-authored-by: Peter Jun Park <peter.park@amd.com>

docs/tutorial/includes/vector-memory-operation-counting.rst

@@ -623,7 +623,7 @@ manner. See
 for further reading on this instruction type.
 
 We develop a `simple
-kernel <https://github.com/ROCm/omniperf/blob/dev/sample/stack.hip>`__
+kernel <https://github.com/ROCm/omniperf/blob/amd-mainline/sample/stack.hip>`__
 that uses stack memory:
 
 .. code-block:: cpp