🔧 Add pre-commit with first config and first formatting pass (#4888)

🔧 Add pre-commit with first config and first formatting pass (#4888)

* 🔧 Add first pre-commit config

* 🎨 Format YAML files with pre-commit

* 🎨 Format Markdown with pre-commit

* 🎨 Format SVGs, drawio, JS, HTML with pre-commit

* ➕ Add pre-commit to dev dependencies

* ⬇️ Extend pre-commit range to support Python 3.6