change notes 2024-02-12

Changing notes to change notes (in the filenames) and adding notes as a distinct category, removing ‘notes’ from the permalinks.
- Examples:
  - change notes: /changes/2024/02/12/notes => /changes/2024/02/12/
    - title changes as well: “changes 2024-02-12” => “change notes 2024-02-12”
  - notes: /notes/2024/02/12/
- in YAML front matter: - permalink: /:categories/:year/:month/:day/
- How? A Find & Replace in Sublime across _posts adding the permalink wherever changes was the category. Changed 57 files. I will fix the redirects separately. Then updated by newpost.py script to add it automatically.

    elif category in ["changes", "notes"]:
        permalink_line = "\npermalink: /:categories/:year/:month/:day/"

    [ . . . ]

    if category == "changes":
        title = f"change notes {date}"
        filename = f"{date}-change-notes.md"
    elif category == "notes":
        title = f"notes {date}"
        filename = f"{date}-notes.md"