Great-tables

Many small fixes were done in this release, including:

* fix: handle addition in scss template by machow in https://github.com/posit-dev/great-tables/pull/72
* add hyperlinks in table example by kmasiello in https://github.com/posit-dev/great-tables/pull/70
* Implement the `tab_style()` method by rich-iannone in https://github.com/posit-dev/great-tables/pull/68
* Ensure that `tab_source_note()` works when using `md()` or `html()` by rich-iannone in https://github.com/posit-dev/great-tables/pull/77
* ci: pre-commit checks by machow in https://github.com/posit-dev/great-tables/pull/78
* Make invocation `loc.body()` default to all columns and rows by rich-iannone in https://github.com/posit-dev/great-tables/pull/79

New Contributors
* kmasiello made their first contribution in https://github.com/posit-dev/great-tables/pull/70

A few additions were made here:

* **docs**: fix code example in README.md by cscheid in https://github.com/posit-dev/great-tables/pull/62
* **feat**: shiny output and renderer for GT by machow in https://github.com/posit-dev/great-tables/pull/59
* **refactor**: replace libsass code with webcolors by machow in https://github.com/posit-dev/great-tables/pull/61
- This enables us to use `great_tables` in https://shinylive.io!

Here is an example shiny app:

python
from shiny import App, ui

from great_tables import GT, exibble
import great_tables.shiny as gts

app_ui = ui.page_fluid(gts.output_gt("table"))

def server(input, output, session):
output
gts.render_gt
def table():
return GT(exibble)

app = App(app_ui, server)

* Ensured that column selections exclude columns that are in the stub. (https://github.com/posit-dev/great-tables/pull/49)
* Dataclasses are now frozen. (https://github.com/posit-dev/great-tables/pull/50)
* Added several tests and incorporated `pytest-cov`. (https://github.com/posit-dev/great-tables/pull/53, https://github.com/posit-dev/great-tables/pull/54, https://github.com/posit-dev/great-tables/pull/55)
* Remove datasets from top-level module (except for `exibble`); added `data` submodule. (https://github.com/posit-dev/great-tables/pull/57)
* Performed several rendering fixes. (https://github.com/posit-dev/great-tables/pull/58)

This release rounds out our initial API offering, with:

* structuring of a table with spanners, row groups, and stub labels
* fully fleshed-out formatting methods with locale support
* support for polars and polars selectors (e.g., `cs.starts_with`, etc.)
* addition of the `vals` submodule to enable formatting of values outside of a table context
* a *Get Started* guide on the docs site along with many examples in the API reference

This release contains fairly comprehensive implementations of a top-level `GT` object, with:

* Reasonably featureful `fmt_()*` methods
* Methods for titles, subtitles, and table notes
* Internal work for implementing spanners, and row and group columns (in a future release).