[FORK] Rename the project mentions from `sktime` to new package name

[MatthewMiddlehurst]

This includes:

• documentation
• README [FORK] Update README (IN PROGRESS) #43
• configuration files: pyproject.toml etc.

[MatthewMiddlehurst]

Still deciding on a new project name, see #70

[MatthewMiddlehurst]

This has mostly concluded. There may be a couple remaining, but can replace when seen.