Add support for astro (#4780)

* feat: prettier for astro
* feat: eslint for astro
* feat: doc for astro

autoload/ale/fix/registry.vim

@@ -137,7 +137,7 @@ let s:default_registry = {
 \   },
 \   'eslint': {
 \       'function': 'ale#fixers#eslint#Fix',
-\       'suggested_filetypes': ['javascript', 'typescript'],
+\       'suggested_filetypes': ['javascript', 'typescript', 'astro'],
 \       'description': 'Apply eslint --fix to a file.',
 \   },
 \   'mix_format': {
@@ -152,7 +152,7 @@ let s:default_registry = {
 \   },
 \   'prettier': {
 \       'function': 'ale#fixers#prettier#Fix',
-\       'suggested_filetypes': ['javascript', 'typescript', 'css', 'less', 'scss', 'json', 'json5', 'graphql', 'markdown', 'vue', 'svelte', 'html', 'yaml', 'openapi', 'ruby'],
+\       'suggested_filetypes': ['javascript', 'typescript', 'css', 'less', 'scss', 'json', 'json5', 'graphql', 'markdown', 'vue', 'svelte', 'html', 'yaml', 'openapi', 'ruby', 'astro'],
 \       'description': 'Apply prettier to a file.',
 \   },
 \   'prettier_eslint': {

autoload/ale/fixers/prettier.vim

@@ -79,6 +79,7 @@ function! ale#fixers#prettier#ApplyFixForVersion(buffer, version) abort
         \    'openapi': 'yaml',
         \    'html': 'html',
         \    'ruby': 'ruby',
+        \    'astro': 'astro',
         \}
 
         for l:filetype in l:filetypes

autoload/ale/linter.vim

@@ -40,6 +40,7 @@ let s:default_ale_linter_aliases = {
 " NOTE: Update the g:ale_linters documentation when modifying this.
 let s:default_ale_linters = {
 \   'apkbuild': ['apkbuild_lint', 'secfixes_check'],
+\   'astro': ['eslint'],
 \   'csh': ['shell'],
 \   'elixir': ['credo', 'dialyxir', 'dogma'],
 \   'go': ['gofmt', 'golangci-lint', 'gopls', 'govet'],