Add FreeBSD Release 14.0 and Update Past Release Links

Added Release 14.0 and point past release links to archives link.

When updating an existing appliance:

[x] The new version is on top.
[x] The filenames in the "images" section are unique, to avoid appliances / version overwriting each other.
[x] If you forked the repo, running check.py doesn't drop any errors for the updated file. (warnings unrelated)

When creating a new appliance:
[x] You dragged an instance into a project on your box, got it installed (if necessary), and did some basic network checks (ping, UI reachable, etc.).
[x] GNS3 VM can run it without any tweaks.
[x] The device is in the right category: router, switch, guest (hosts), firewall
[x] You filled in as much info as possible (checks the schemas and other appliance files for some guidance).
[x] The filenames in the "images" section are unique (to avoid appliances and/or versions overwriting each other).
[x] If you forked the repo, running check.py doesn't drop any errors for the new file. (warnings unrelated)

GNS3 / gns3-registry