Make ignores in all plugins more adaptable: Read from file / folder

[trueberryless]

In larger documentation websites, like e.g. the Astro docs, it will be hard to maintain a list of strings in the astr.config.mjs file for the words that should be ignored by the different plugins.

I therefore recommend, implementing a more dynamic zod schema for all ignore fields, which can either be a list of words to ignore (z.array(z.string()).default([])) or a file path to a single file or folder (z.string().optional()). In case the string has a file extension, it can be assumed that this is a file, if it ends with / than we can assume, that in this folder there exist files with the locals, e.g.: en.md, fr.md, de.md.

We have to think about how we know the extensions of the files in the folder. Maybe just allow Markdown or support more extensions, like yaml...

This would lead to some kind of zod definition which looks like this:

/**
 * Defines a list of words that should be ignored by the spell checker.
 *
 * The words in this list will be ignored by the spell checker and will not be considered as misspelled.
 *
 * @default []
 */
ignore: z
  .union([
    z.array(z.string()),
    z.string().refine(
      (path) => {
        if (path.endsWith("/")) {
          return true;
        }
        const lastSegment = path.split("/").pop();
        return lastSegment?.includes(".") ?? false;
      },
      {
        message:
          "The string must either end with a '/' (indicating a folder) or include an extension (indicating a file).",
      }
    ),
  ])
  .default([]),

One difficult point is how to read the relative path of the file from the plugin. Therefore, I'll set the milestone to v0.2.0 as I think I rather wanna publish the v0.1 soon and can implement this logic later.