feature: future releases

[chrisdicaprio]

As distributors of the NSHM we want to let users know what features/science/purpose future revisions will have and when they will be available.

• a future revisions page
• linked from About
• under Resources menu
• the in collaboration with says "2022 model in collaboration with"

The Future revisions page should have

• list of future revisions (2028, 2030)
• what those revisions will have (joint ruptures, 1 yr time dependence, aftershock model, etc.)