Start a README in the github workflow directory.

Tweaks to docker readme.

Tweaks to main readme.

Signed-off-by: Jason Volk <jason@zemos.net>

.github/workflows/README.md

@@ -0,0 +1,13 @@
+## Overview
+
+The release pipeline `Main` (main.yml) and its subroutines defined in the other yamls form a high-level
+description for the underlying self-hosted build system in  `/docker`. In other words, this is a sort of
+terminal, a "thin-client" with a display and a keyboard for our docker mainframe. We minimize
+vendor-lockin and duplication with other frameworks by limiting everything here to only what is
+essential for driving the docker builder.
+
+Though we slightly relax the above by specifying details of the actual CI pipeline, the 
+control-flow logic to go from some input event to some output or release here. This gives us
+better integration  with github, like granular progress indications by breaking up operations
+as individual jobs and workflows within the pipeline. This means we'll have duplicate logic
+with other services, but only as it relates to high-level control flow.