Add optional tree-sitter highlighting

[willfish]

📃 Summary

Adds an optional syntax_highlighting config for slide buffers.

When enabled, presenting.nvim starts tree-sitter highlighting after rendering each slide. For markdown presentations this lets tree-sitter injections highlight fenced code blocks when the user has the relevant parsers installed.

Example config:

require("presenting").setup({
  syntax_highlighting = {
    enabled = true,
    parser = "markdown",
  },
})

For markdown fenced code blocks, users need the markdown and markdown_inline parsers, plus parsers for the code block languages they use, such as lua, ruby, bash, or sql.

📸 Preview

📝 Checklist

• I ran make all locally and checked for errors.
• I have updated the CHANGELOG.md file.

[sotte]

Thanks for the pr!

I have to check this. I have proper syntax hl without doing anything.

[sotte]

Just checked by presenting the README.md. Without any config changes and without your PR I get syntax hl.

Is this not working for you?

[willfish]

Interesting! I'll look into it but this wasn't working for me @sotte

[willfish]

Also appreciate you having a gander at this and thanks for putting this project together - I've used it for years/it makes giving training and presentations much more comfortable for me

[sotte]

Appreciate the kind words!

If you turn this into a non breaking change, I'll merge it. No harm :)

[willfish]

Closing as I think this is a my config issue