Remove pkg_resources for reading style.css

[Tronic]

Fix #9. Needs testing & review.

[felixonmars]

This appears to be broken for me:

$ python -c "import tracerite"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.11/site-packages/tracerite/__init__.py", line 1, in <module>
    from .html import html_traceback
  File "/usr/lib/python3.11/site-packages/tracerite/html.py", line 7, in <module>
    style = files(__name__).join_path("style.css").read_text(encoding="UTF-8")
            ^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/importlib/resources/_common.py", line 22, in files
    return from_package(get_package(package))
                        ^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/importlib/resources/_common.py", line 55, in get_package
    raise TypeError(f'{package!r} is not a package')
TypeError: 'tracerite.html' is not a package

While the old version works fine here.

[zbynekwinkler]

Suggested change

	style = files(__name__).join_path("style.css").read_text(encoding="UTF-8")
	style = files(__package__).joinpath("style.css").read_text(encoding="UTF-8")

This way it works for me.

[ozancaglayan]

This is still broken I guess. You're just lucky if one of the deps in the env pulls in setuptools or not. The moment tracerite is the only one, we get the exception.