Tidy up the Community Builds Table

[angerson]

The Community Builds stable has been migrated, but still could use cleanup. See my comment here for the specifics of each entry:

• [ ] RedHat builds: fix broken links (@sub-mod)
• [ ] AMD builds: fix stale links and split the 1.x / 2.x row(s) into two rows each (@deven-amd, last comment)
• [ ] Openlab builds: verify owner and recency, and split 1.x / 2.x rows. Stable last ran for TF 2.1. (@bzhaoopenstack)
• [ ] Intel builds: verify owner and build status and split 1.x / 2.x rows. (@gaurides @claynerobison)

@sub-mod and @deven-amd were both looking at their issues, but I haven't heard back from Openlab or Intel yet, so I'll reach out if I need to.