Remove non-0.9.6 entries

Part of #218
Remove non-0.9.5 entries

Part of #218
Remove non-0.9.4 entries

Part of #218
Fix version for 0.9.2.2 release notes
Remove non-0.8.5 entries

Part of #218
Fix version in 0.5.4 release notes
Fix version in 0.5.3 release notes
Remove non-10.0.2 entries

Part of #218
Improve consistency of headings