fix(deps): update docusaurus monorepo to v2.4.0

Author: renovate[bot]

yarn.lock

@@ -1760,9 +1760,7 @@
     sitemap "^3.2.2"
 
 "@docusaurus/preset-classic@^2.0.0-alpha.70":
-  version "2.0.0-alpha.70"
-  resolved "https://registry.yarnpkg.com/@docusaurus/preset-classic/-/preset-classic-2.0.0-alpha.70.tgz#7857f606eecdbaa34f8df83d62812908be02126f"
-  integrity sha512-Zx98KryJjHiqzGisWKR0glXl0HXuf/YbcK9yUl6ySyS+6cIMAuGMS0HGLgbvvEmYjywz7nMLpijzGderEOihjQ==
+  version "2.4.0"
   dependencies:
     "@docusaurus/core" "2.0.0-alpha.70"
     "@docusaurus/plugin-content-blog" "2.0.0-alpha.70"