use eslint/prettier like error reporting

to see if GitHub picks up errors in UI

Author: sidvishnoi

tools/respec2html.js

@@ -48,21 +48,25 @@ class Logger {
    * @param {RsError} rsError
    */
   error(rsError) {
-    const header = colors.bgRed.white.bold("[ERROR]");
     const message = colors.red(this._formatMarkdown(rsError.message));
-    console.error(header, message);
-    if (rsError.plugin) {
-      this._printDetails(rsError);
+    if (rsError.location) {
+      for (const loc of rsError.location) {
+        const [file, lineNumber] = loc.split(":");
+        console.error(file);
+        console.error(`  ${lineNumber}:0`, "error", message);
+      }
     }
   }
 
   /** @param {RsError} rsError */
   warn(rsError) {
-    const header = colors.bgYellow.black.bold("[WARNING]");
     const message = colors.yellow(this._formatMarkdown(rsError.message));
-    console.error(header, message);
-    if (rsError.plugin) {
-      this._printDetails(rsError);
+    if (rsError.location) {
+      for (const loc of rsError.location) {
+        const [file, lineNumber] = loc.split(":");
+        console.error(file);
+        console.error(`  ${lineNumber}:0`, "warning", message);
+      }
     }
   }