Centralize project/WG specific glossaries

[di]

There are various glossaries spread across projects, e.g.:

• https://github.com/ossf/criticality_score/blob/9f98c937f457496ecc5ce42e58314c9c5c141b18/docs/glossary.md#L1
• https://github.com/ossf/fuzz-introspector/blob/a72717b73a88385adcd3ae5c7a7038a35285b8c9/doc/Glossary.md#L1
• https://github.com/ossf/education/blob/6b3d9855d1d787258dde9bbdcc5afea4fe6fa718/terminology/glossary.md
• https://github.com/ossf/secure-sw-dev-fundamentals/blob/1be93f45965826755a55c362be43bc491cf5e7a2/secure_software_development_fundamentals.md#glossary

Ideally these would be centralized here, where appropriate, and link to this glossary instead.