Revert "Change "if blocked" Windows installer link to project server"

This reverts commit 8d6d3ee352bd19de8c7fc83e330bd3570b72743b.

We are establishing the convention that
downloads.freenetproject.org/latest redirects to somewhere else on
downloads.freenetproject.org, and /jnlp/ redirects to Google Drive.
Revert "Link Windows installer to redirect instead of Drive directly"

This reverts commit 15e73ef3a1826dc1723be21f62784e33af869a2e.

/latest/ does not redirect to Google Drive.
Replace GDrive links with /jnlp/ redirects

This also documents the convention that /jnlp/ redirects to GDrive and
/latest/ redirects elsewhere on FPI infrastructure.
Remove FREENETVERSION links from installer pages

/latest/ redirects to the same thing.