Improves download and plugins pages
Proposed changes:
https://www.frama-c.com/html/get-frama-c.html becomes:
https://www.frama-c.com/html/kernel-plugin.html becomes:
Proposed changes:
https://www.frama-c.com/html/get-frama-c.html becomes:
https://www.frama-c.com/html/kernel-plugin.html becomes: