Docs: Update docs to prepare for 0.10.0 release

CHANGES.md

README.md

docs/en/guide/keys-and-certificates.html

docs/en/guide/keys-and-certificates/index.html

docs/en/guide/virtual-machines.html

docs/en/guide/virtual-machines/index.html

docs/en/services.html

docs/en/services/couchdb.html

docs/en/services/couchdb/index.html

docs/en/services/index.html

docs/en/services/mx.html

docs/en/services/mx/index.html

docs/en/services/openvpn.html

docs/en/services/openvpn/index.html

docs/en/services/tor.html

docs/en/services/tor/index.html

docs/en/troubleshooting/known-issues.html

docs/en/troubleshooting/known-issues/index.html

docs/en/troubleshooting/where-to-look.html

docs/en/troubleshooting/where-to-look/index.html