chore: Update package dependencies and remove .yarnrc.yml

- Upgrade 'remark' to version 12.0.1 and related packages for improved functionality.
- Remove obsolete .yarnrc.yml file as it is no longer needed.

Author: artimath

.yarnrc.yml

@@ -90,9 +90,7 @@
     "postcss-preset-env": "^6.7.0",
     "prettier": "^2.5.1",
     "reading-time": "^1.2.0",
-    "remark": "^15.0.1",
-    "remark-mdx": "^3.1.0",
-    "remark-stringify": "^11.0.0",
+    "remark": "^12.0.1",
     "remark-external-links": "^7.0.0",
     "remark-html": "^12.0.0",
     "remark-images": "^2.0.0",
@@ -119,4 +117,4 @@
     "src/**/*.md": "yarn fix-headings"
   },
   "packageManager": "yarn@1.22.22"
-}
+}