refactor: rename fix-first-nbcell to set-nb-cells

[redeboer]

Tested this PR ComPWA/ampform#226.

Interface changes

Sub-hook --fix-first-nbcell has been renamed to --set-nb-cell. Use the following example config instead:

  - repo: https://github.com/ComPWA/repo-maintenance
    rev: ...
    hooks:
      - id: set-nb-cells
        args:
          - --add-install-cell
          - --additional-packages=IPython
          - --extras-require=doc,viz

Notebooks can be ignored by adding a Markdown cell with comment <!-- no-set-nb-cells -->.

New features

• Added an import statement from IPython.display import display. This is to:
  • help syntax highlighting when viewing the notebook in VS Code.
  • render display statements as links in the documentation (see Embed intersphinx links in code snippets compwa.github.io#106). See example of a display() link here.
• Config cell and install cell have been switched: install cell comes before the config cell