fix: remove unused types from types.ts (#462)

Author: lumirlumir

src/types.ts

@@ -38,7 +38,6 @@ import type {
 	// Extensions (front matter)
 	Yaml,
 } from "mdast";
-import type { Linter } from "eslint";
 import type {
 	LanguageOptions,
 	LanguageContext,
@@ -78,10 +77,6 @@ export interface Block extends Node, BlockBase {
 	meta: string | null;
 }
 
-export type Message = Linter.LintMessage;
-
-export type RuleType = "problem" | "suggestion" | "layout";
-
 /**
  * Markdown TOML.
  */