tpl/tmplimpl: Add MIME type to embedded JS

So they get minified correctly.

See #5042

tpl/tplimpl/embedded/templates/disqus.html

@@ -1,7 +1,7 @@
 {{- $pc := .Page.Site.Config.Privacy.Disqus -}}
 {{- if not $pc.Disable -}}
 {{ if .Site.DisqusShortname }}<div id="disqus_thread"></div>
-<script>
+<script type="application/javascript">
     var disqus_config = function () {
     {{with .GetParam "disqus_identifier" }}this.page.identifier = '{{ . }}';{{end}}
     {{with .GetParam "disqus_title" }}this.page.title = '{{ . }}';{{end}}

tpl/tplimpl/embedded/templates/google_analytics.html

@@ -1,7 +1,7 @@
 {{- $pc := .Site.Config.Privacy.GoogleAnalytics -}}
 {{- if not $pc.Disable -}}
 {{ with .Site.GoogleAnalytics }}
-<script>
+<script type="application/javascript">
 {{ template "__ga_js_set_doNotTrack" $ }}
 if (!doNotTrack) {
 	(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){

tpl/tplimpl/embedded/templates/google_analytics_async.html

@@ -1,7 +1,7 @@
 {{- $pc := .Site.Config.Privacy.GoogleAnalytics -}}
 {{- if not $pc.Disable -}}
 {{ with .Site.GoogleAnalytics }}
-<script>
+<script type="application/javascript">
 {{ template "__ga_js_set_doNotTrack" $ }}
 if (!doNotTrack) {
 	window.ga=window.ga||function(){(ga.q=ga.q||[]).push(arguments)};ga.l=+new Date;

tpl/tplimpl/embedded/templates/shortcodes/gist.html

@@ -1 +1 @@
-<script src="//gist.github.com/{{ index .Params 0 }}/{{ index .Params 1 }}.js{{if len .Params | eq 3 }}?file={{ index .Params 2 }}{{end}}"></script>
+<script type="application/javascript" src="//gist.github.com/{{ index .Params 0 }}/{{ index .Params 1 }}.js{{if len .Params | eq 3 }}?file={{ index .Params 2 }}{{end}}"></script>