style(markdown): enforce no-hard-tabs

Author: vburzynski

.markdownlint-cli2.jsonc

@@ -24,9 +24,8 @@
     /* MD009 - Trailing spaces */
     "no-trailing-spaces": true,
 
-    // FIXME: enable and configure?
     /* MD010 - Hard tabs */
-    "no-hard-tabs": false,
+    "no-hard-tabs": true,
 
     /* MD011 - Reversed link syntax */
     "no-reversed-links": true,

javascript/README.md

@@ -27,11 +27,11 @@
 
 - Use [Prettier defaults](https://prettier.io/docs/en/options.html) with the following additional configuration (.prettierrc):
 
-	```json
-	{
-	  "singleQuote": true
-	}
-	```
+  ```json
+  {
+    "singleQuote": true
+  }
+  ```
 
   This configuration includes:
   - Use semicolons at the end of each statement ([sample](/javascript/sample.js#L5))