[suggestion] Introduce consistent code cormatting (stylua, markdownlint, prettier)

[NStefan002]

Hi,

First of all, thank you for the great work on this project.

I'd like to propose introducing standard formatting tools. This will make contributing and maintaining easier.

Since all of the functionality of this project is in the Lua files, and all of the documentation is in the Markdown files, we would only need a couple of configuration files:

• .stylua.toml for Lua formatting
• .markdownlint.toml for Markdown style consistency
• .prettierrc for formatting Markdown files

If you're open to it, I’d be happy to open a PR that adds these configuration files, and also a CONTRIBUTING.md file that would give a short note to maintainers/new contributors about how to use these tools. Also, I could add GitHub actions to check formatting on every push and pr.

[Ryuno-Ki]

Would be great to have next to luacheck:

awesome-wm-widgets/.github/workflows/build.yml

Line 30 in 60fb36e

uses: nebularg/actions-luacheck@v1.1.0