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

docs/language-support.md

@@ -1,12 +0,0 @@
----
-id: language-support
-title: Language Support
----
-
-Prettier attempts to support all JavaScript language features, including non-standardized ones. By default it uses the [Babylon](https://github.com/babel/babylon) parser with all language features enabled, but you can also use the [Flow](https://github.com/facebook/flow) parser with the `parser` API or `--parser` CLI [option](options.md).
-
-All of JSX and Flow syntax is supported. In fact, the test suite in `tests/flow` _is_ the entire Flow test suite and they all pass.
-
-Prettier also supports [TypeScript](https://www.typescriptlang.org/), CSS, [Less](http://lesscss.org/), [SCSS](http://sass-lang.com), [Vue](https://vuejs.org/), [JSON](http://json.org/), [GraphQL](http://graphql.org/), [Markdown](http://commonmark.org), and [YAML](http://yaml.org/).
-
-The minimum version of TypeScript supported is 2.1.3 as it introduces the ability to have leading `|` for type definitions which prettier outputs.

website/sidebars.json

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