Compact Function List by Name Document

[oleibman]

The entries in the "function list by name" document are very long, and almost all of them require horizontal scrolling, which is not very convenient for the end-user. This PR creates a "function list by name compact" document, in which CATEGORY_ is stripped from all the category names and PhpOffice\PhpSpreadsheet\Calculation\ is stripped from all the functions. I believe this eliminates the need to scroll horizontally within the document. I waffled on whether this should replace the existing document, or whether it should be an additional document. I decided there was probably some merit in keeping the old, and hardly any down-side, so, at least for now, we will generate both documents, and they will link to each other.

No changes to source code.

This is:

• a bugfix
• a new feature
• refactoring
• additional unit tests
• documentation

Checklist:

• Changes are covered by unit tests
  • Changes are covered by existing unit tests
  • New unit tests have been added
• Code style is respected
• Commit message explains why the change is made (see https://github.com/erlang/otp/wiki/Writing-good-commit-messages)
• CHANGELOG.md contains a short summary of the change and a link to the pull request if applicable
• Documentation is updated as necessary