feat: add initial add article command

lib/helpers.ts

@@ -5,3 +5,28 @@ export function json(content: unknown) {
     headers,
   });
 }
+
+export const isValidUrl = (urlString: string) => {
+  try {
+    return Boolean(new URL(urlString));
+  } catch (e) {
+    return false;
+  }
+};
+
+export const fixRenderedMarkdown = (content: string) => {
+  return content.replace("***\n", "---")
+    .replace("----------------", "---")
+    .replace("\n---", "---")
+    .replace(/^(date:[^'\n]*)'|'/gm, (match, p1, p2) => {
+      if (p1) {
+        // This is a line starting with date: followed by single quotes
+        return p1.replace(/'/gm, "");
+      } else if (p2) {
+        return "";
+      } else {
+        // This is a line with single quotes, but not starting with date:
+        return match;
+      }
+    });
+};