[2.1] OCP deployment of OCDS documentation

[robredpath]

• Create new standalone dev docs server. Ask for a OCP subdomain for this.
• Move dev site, resolving any issues in deploying process this creates
• Remove dev site from current server
• Create new standalone live docs server.
• Move live site, resolving any issues in deploying process this creates
• Remove live site from current server
• Add SSL to live site via Lets Encrypt

[odscjames]

This is done, apart from

• the SSL, which is now handled in https://github.com/open-contracting/standard/issues/878
• adding Icinga to the new servers, which @idlemoor is looking at