Add highlight.js 8.3 from the highlight.js standalone repo.

highlight_js_8.3.0/styles/ascetic.css

Index: highlight_js_8.3.0/styles/ascetic.css
diff --git a/highlight_js_8.3.0/styles/ascetic.css b/highlight_js_8.3.0/styles/ascetic.css
new file mode 100644
index 0000000000000000000000000000000000000000..368c51411fa57d160185652964be6a49b7d1704c
--- /dev/null
+++ b/highlight_js_8.3.0/styles/ascetic.css
@@ -0,0 +1,53 @@
+/*
+
+Original style from softwaremaniacs.org (c) Ivan Sagalaev <Maniac@SoftwareManiacs.Org>
+
+*/
+
+.hljs {
+  display: block;
+  overflow-x: auto;
+  padding: 0.5em;
+  background: white;
+  color: black;
+  -webkit-text-size-adjust: none;
+}
+
+.hljs-string,
+.hljs-tag .hljs-value,
+.hljs-filter .hljs-argument,
+.hljs-addition,
+.hljs-change,
+.apache .hljs-tag,
+.apache .hljs-cbracket,
+.nginx .hljs-built_in,
+.tex .hljs-formula {
+  color: #888;
+}
+
+.hljs-comment,
+.hljs-template_comment,
+.hljs-shebang,
+.hljs-doctype,
+.hljs-pi,
+.hljs-javadoc,
+.hljs-deletion,
+.apache .hljs-sqbracket {
+  color: #ccc;
+}
+
+.hljs-keyword,
+.hljs-tag .hljs-title,
+.ini .hljs-title,
+.lisp .hljs-title,
+.http .hljs-title,
+.nginx .hljs-title,
+.css .hljs-tag,
+.hljs-winutils,
+.hljs-flow,
+.apache .hljs-tag,
+.tex .hljs-command,
+.hljs-request,
+.hljs-status {
+  font-weight: bold;
+}