Remove disqus as it will be replaced with discourse (#71)

Author: lafriks

config.yaml

@@ -2,7 +2,6 @@ baseurl: https://blog.gitea.io/
 languageCode: en-us
 title: Blog
 theme: gitea
-disqusShortname: gitea
 
 defaultContentLanguage: en-us
 defaultContentLanguageInSubdir: true

layouts/index.html

@@ -48,12 +48,6 @@ <h2>
 				</div>
 			{{ end }}
 		</div>
-
-		{{ if .Site.DisqusShortname }}
-			<div class="col-xs-12">
-				{{ partial "disqus.html" . }}
-			</div>
-		{{ end }}
 	</div>
 </div>
 

static/_headers

@@ -1,5 +1,5 @@
 /*
-  Content-Security-Policy: default-src 'self'; script-src 'self' 'unsafe-inline' https://gitea.disqus.com https://c.disquscdn.com https://disqus.com; style-src 'self' https://fonts.googleapis.com https://cdnjs.cloudflare.com https://c.disquscdn.com; font-src 'self' data: https://cdnjs.cloudflare.com https://fonts.gstatic.com; img-src 'self' https://referrer.disqus.com https://c.disquscdn.com; frame-src 'self' https://disqus.com https://disqusads.com
+  Content-Security-Policy: default-src 'self'; script-src 'self' 'unsafe-inline' https://discourse.gitea.io https://discourse-cdn-sjc2.com; style-src 'self' https://fonts.googleapis.com https://cdnjs.cloudflare.com https://discourse-cdn-sjc2.com; font-src 'self' data: https://cdnjs.cloudflare.com https://fonts.gstatic.com; img-src 'self' https://discourse.gitea.io https://discourse-cdn-sjc2.com; frame-src 'self' https://discourse.gitea.io
   X-Frame-Options: DENY
   X-Xss-Protection: 1; mode=block
   X-Content-Type-Options: nosniff