Add license; make corrections; cleanup

shims.d.ts

@@ -1,4 +1,14 @@
 declare module '*.yaml' {
     const record: Record<string, any>;
     export default record;
+}
+
+declare module '*.md' {
+    const rawmd: string;
+    export default rawmd;
+}
+
+declare module '*.txt' {
+    const content: string;
+    export default content;
 }