Quarto plugin

[pat-alt]

This adds a new Quarto plugin that can be used to generate package documentation with Quarto and Documenter.jl. I've closely followed the steps outlined by @kellertuer in this blog post and also during our joint JuliaCon presentation earlier this year.

Additions

• The dictionary in src/plugins/ci.jl (l. 79) gets a HAS_QUARTO field to be used in templates. The HAS_DOCUMENTER field is adjusted.
• The src/plugins/quarto.jl adds the plugin, which 1) inherits its view from the Readme and Documenter plugins; 2) generates a README.qmd, docs/src/index.qmd, a custom executable make.jl (includes steps for remote rendering) and a _quarto.yml (configs for Quarto).
• Additions in templates/github/workflows/CI.yml ensure that docs are rendered through Quarto if he plugin is used.
• There are additional templates in templates/quarto/ for the README.qmd, index.qmd, _quarto.yml and make.jl.

All other changes are due to running JuliaFormatter.format("src").

Doubts and other notes

• I have not added workflows related to Jupyter (i.e. CondaPkg and caching), because I'd expect that most users will use QuartoNotebookRunner.jl in the future.
• I'm working on a separate branch to add support for a fixup function (continuing from this stale PR) and accidentally merged some of this here initially (should be all reverted in 3910fe6006e3ad037e8e7a5d3ccfaca2d9860e77)
• I have used the plugin for a new Taija package and it seems to run smoothly, but I'm not sure how to go about properly unit testing things like remote rendering.

@kellertuer might you be able to have a quick look at this and see if you spot any missing pieces?

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 55.96330% with 48 lines in your changes missing coverage. Please review.

Project coverage is 88.13%. Comparing base (a007c9e) to head (3910fe6).

Files	Patch %	Lines
src/plugins/quarto.jl	0.00%	41 Missing :warning:
src/interactive.jl	87.50%	2 Missing :warning:
src/plugins/formatter.jl	0.00%	2 Missing :warning:
src/plugins/coverage.jl	75.00%	1 Missing :warning:
src/plugins/documenter.jl	85.71%	1 Missing :warning:
src/plugins/git.jl	66.66%	1 Missing :warning:

:exclamation: There is a different number of reports uploaded between BASE (a007c9e) and HEAD (3910fe6). Click for more details.

HEAD has 134 uploads less than BASE

| Flag | BASE (a007c9e) | HEAD (3910fe6) | |------|------|------| ||143|9|

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #482 +/- ## ========================================== - Coverage 94.33% 88.13% -6.21% ========================================== Files 24 25 +1 Lines 742 784 +42 ========================================== - Hits 700 691 -9 - Misses 42 93 +51 ```

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