Add default language server for HTML (#2018)

book/src/generated/lang-support.md

@@ -23,7 +23,7 @@
 | graphql | ✓ |  |  |  |
 | haskell | ✓ |  |  | `haskell-language-server-wrapper` |
 | hcl | ✓ |  | ✓ | `terraform-ls` |
-| html | ✓ |  |  |  |
+| html | ✓ |  |  | `vscode-html-language-server` |
 | iex | ✓ |  |  |  |
 | java | ✓ |  |  |  |
 | javascript | ✓ |  | ✓ | `typescript-language-server` |

languages.toml

@@ -348,6 +348,9 @@ scope = "text.html.basic"
 injection-regex = "html"
 file-types = ["html"]
 roots = []
+language-server = { command = "vscode-html-language-server", args = ["--stdio"] }
+auto-format = true
+config = { "provideFormatter" = true }
 indent = { tab-width = 2, unit = "  " }
 
 [[grammar]]