Support `deprecated`

[ramimac]

• [x] Add optional field to schema and validator
• [x] Populate
• [x] Remove from titles

These can instead be in the yaml. Preferably not a deprecated: true because that name would be set in the "negative" instead of "positive"

# simple enabled/disabled, if disabled, assume deprecated
enabled: false
# if this key is set, assume deprecated
deprecated_date: 2025-12-31

[nitrocode]

A separate file for deprecated entries is also an option