release-10.29.2021-16.50

🚀 What's new?

@austin-schaefer - style(homepage): Re-organize homepage left nav ->
@austin-schaefer - fix(homepage): Remove extra section break ->
@mmfred - fix(php agent): removed some formatting ->
@barbnewrelic - fix(Licenses): Delete Priority Support doc+pdf ->
@bradleycamacho - chore: errors inbox updates ->
@barbnewrelic - Merge pull request #4632 from newrelic/neilh-support-pdf ->
@austin-schaefer - Merge pull request #4624 from newrelic/root-nav-alpha-order-alt ->
@mmfred - Merge pull request #4631 from newrelic/mmfred-patch-1 ->
@mmfred - fix(pixie): updated tags on the ingest page ->
@bradleycamacho - Merge pull request #4633 from newrelic/errors-inbox-updates ->
@mmfred - Merge pull request #4634 from newrelic/mmfred-patch-1 ->