start extracting types to shared .d.ts file

types/index.d.ts

@@ -0,0 +1,17 @@
+export type NoteMetaType = {
+  title: string;
+  htmlTitle?: string;
+  date: string;
+  slug: string;
+  permalink: string;
+  description?: string;
+  image?: string;
+  tags?: string[];
+  readingMins?: number;
+  noComments?: boolean;
+};
+
+export type NoteType = {
+  frontMatter: NoteMetaType;
+  mdxSource: string;
+};