Disable "Run Block" CodeLens for GitHub workflows

[christian-bromann]

Support for interactively running GitHub workflows in Runme only works when using the notebook view. I would suggest two options:

1. when clicking "Run Block" render it in the bottom bar
2. just disable the "Run Block" button in this case

wdyt?

[sourishkrout]

Now that we have relaxed the supported cell langs, we could introduce something like URL or Resource in the langID and if we detect it open the URL/Resource, kicking it out into the browser. Same could happen on the command line.

For the time being, we are ok with this being unfinished.