Migrate best practices 7.1 to 7.8 to best practices repository

[cjmyers]

Move best practices 7.1 to 7.8 to the best practices repository found here:

https://github.com/SynBioDex/SBOL-examples/tree/main/SBOL/best-practices

[cjmyers]

• [x] 7.1 to BP001
• [x] 7.2 to BP002
• [x] 7.3 to BP003
• [x] 7.4 to BP004
• [x] 7.5 to BP005
• [x] 7.6 to BP006
• [x] 7.7 to BP007
• [x] 7.8 to BP008

[cjmyers]

Done