Feature/2024 updates (sethblack#101)

* Use new pyproject.toml

* Remove old setup.py

* Update README to reflect new cli script name seoanalyzer

* Update requirements.txt to include much newer versions of necessary packages and remove requests

* Refactor everything into pyseoanalyzer directory

Fix missing lxml

v4.0.5

Remove hash links

Bump version

Cut at 4.0.2.

Missed tag.

Merge pull request sethblack#50 from sethblack/v4

Version 4.0.0

Update version to 3.1.5.

Set version to 3.1.4.