0.6.0 release document updates.

PiperOrigin-RevId: 191805185

Merge pull request google#57 from cmclean/r0.5

DV 0.5.2 bugfix release: fix gVCF reference base issue

Update example commands and results for the DV 0.5.1 release.

PiperOrigin-RevId: 185166551

Make sure links to docs are complete. Update a few links.

PiperOrigin-RevId: 183890759

Fix for htslib_gcp_oauth when network access is unavailable (was cras…

…hing)

Also adds a test that we don't crash here

PiperOrigin-RevId: 178668854

Project import generated by Copybara.

PiperOrigin-RevId: 177814292