Removed syntastic and replaced it with ale

Read more here:
https://github.com/w0rp/ale

sources_non_forked/ale/doc/ale-html.txt

@@ -0,0 +1,81 @@
+===============================================================================
+ALE HTML Integration                                         *ale-html-options*
+
+
+===============================================================================
+htmlhint                                                    *ale-html-htmlhint*
+
+g:ale_html_htmlhint_executable                 *g:ale_html_htmlhint_executable*
+                                               *b:ale_html_htmlhint_executable*
+  Type: |String|
+  Default: `'htmlhint'`
+
+  See |ale-integrations-local-executables|
+
+
+g:ale_html_htmlhint_options                       *g:ale_html_htmlhint_options*
+                                                  *b:ale_html_htmlhint_options*
+  Type: |String|
+  Default: `''`
+
+  This variable can be changed to modify flags given to HTMLHint.
+
+
+g:ale_html_htmlhint_use_global                 *g:ale_html_htmlhint_use_global*
+                                               *b:ale_html_htmlhint_use_global*
+  Type: |String|
+  Default: `0`
+
+  See |ale-integrations-local-executables|
+
+
+===============================================================================
+tidy                                                            *ale-html-tidy*
+
+`tidy` is a console application which corrects and cleans up HTML and XML
+documents by fixing markup errors and upgrading legacy code to modern
+standards.
+
+Note:
+`/usr/bin/tidy` on macOS (installed by default) is too old. It was released
+on 31 Oct 2006. It does not consider modern HTML specs (HTML5) and shows
+outdated warnings. So |ale| ignores `/usr/bin/tidy` on macOS.
+
+To use `tidy` on macOS, please install the latest version with Homebrew:
+>
+  $ brew install tidy-html5
+<
+`/usr/local/bin/tidy` is installed.
+
+g:ale_html_tidy_executable                         *g:ale_html_tidy_executable*
+                                                   *b:ale_html_tidy_executable*
+  Type: |String|
+  Default: `'tidy'`
+
+  This variable can be changed to change the path to tidy.
+
+
+g:ale_html_tidy_options                               *g:ale_html_tidy_options*
+                                                      *b:ale_html_tidy_options*
+  Type: |String|
+  Default: `'-q -e -language en'`
+
+  This variable can be changed to change the arguments provided to the
+  executable.
+
+  ALE will attempt to automatically detect the appropriate file encoding to
+  provide to html-tidy, and fall back to UTF-8 when encoding detection fails.
+
+  The recognized file encodings are as follows: ascii, big5, cp1252 (win1252),
+  cp850 (ibm858), cp932 (shiftjis), iso-2022-jp (iso-2022), latin1, macroman
+  (mac), sjis (shiftjis), utf-16le, utf-16, utf-8
+
+
+===============================================================================
+write-good                                                *ale-html-write-good*
+
+See |ale-write-good-options|
+
+
+===============================================================================
+  vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl: