Add git precommit hooks

[MeltyBot]

Migrated from GitLab: https://gitlab.com/meltano/handbook/-/issues/82

Originally created by @cjohnhanson on 2022-04-05 20:02:43

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Before commit:

• Changed files should be linted
• Local branch being committed to should be up to date with master in this meltano/handbook repo
  • We would need to either just fail with an informative warning if branch isn't up to date or if we wanted to automatically pull, we would need to be smart about that behavior--how should it merge? What happens if a pull would overwrite local changes?

We can probably do this by:

1. Creating a new .githook directory with a precommit script
2. Adding a preinstall script in package.json which does a git config core.hooksPath .githooks so that precommit hooks are "installed" whenever npm install is run.