Update links of Nuxeo Drive installers

In the Nuxeo Drive tab, links points to old 3.0.x versions.
Update those links to use the new 3.1 branch.

There is now only one HTTPS URL for every server version, so no more maintenance for this part.

GNU/Linux

No changes for now.

MacOS

• Old: http://community.nuxeo.com/static/drive/latest/SERVER_VERSION/nuxeo-drive.dmg
• New: https://community.nuxeo.com/static/drive-updates/nuxeo-drive.dmg

Windows

• Old: http://community.nuxeo.com/static/drive/latest/SERVER_VERSION/nuxeo-drive.msi
• New: https://community.nuxeo.com/static/drive-updates/nuxeo-drive.exe