DX: manage certificates with Makefile

[kaihendry]

• refactor: fetch token programmatically
• refactor: generate all certificates via a makefile and remove .gitignore so we can see them

[subnova]

This commit appears to remove all of our existing hooks - many of which are not related to secrets scanning. Furthermore, there are lots of other types of secret that we may accidentally commit beyond private keys. I'm happy for us to look to replace talisman that is producing many to many false positives, but not sure this is the right option to replace it. I've had success with https://github.com/Yelp/detect-secrets before.

[kaihendry]

I've made some changes, https://github.com/Yelp/detect-secrets has just way too many false positives.

detect-private-key seems like the sanest start. Else revert back to helm?