message: docs: remove diff demo
diff: # About
  -```diff:json
  -{
  - "scripts": {
  -- "precommit": "foo",
  -+ "precommit": "lint-staged"
  - },
  -+ "lint-staged": {
  -+ "*.js": ["eslint --fix", "git add"]
  -+ }
  -}
  -```
  -
  `patternplate` documentation is categorized into **Guides** and **References**.
  * **Guides** are instructions for common use cases that can be followed step by step.
  