Update language support docs (#5178)

* Update language support docs

This commit updates docs language to reflect the change in #4528 that removes the inferred default parser.

* Remove language-support.md docs file

This removes the language support doc file as information is out dated, or available elsewhere in the docs.

* removes language-support from sidebars config

website/sidebars.json

@@ -4,7 +4,6 @@
       "index",
       "why-prettier",
       "comparison",
-      "language-support",
       "option-philosophy",
       "rationale"
     ],