CI: Remove GHA for RTDv3

These actions are getting moved to the .github repo since
they need to run for all repos.

Issue-ID: CIMAN-33
Change-Id: I663a83c4794d6a8901d8e1c72ad13f76993190df
Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>
1 file changed