css: update dtext external link icon selector.

DText was changed so that the .dtext-external-link class is now applied to all external links.
Previously it applied only to named links (ex: "google":[http://www.google.com]), not bare
links (ex: http://www.google.com).

Gemfile.lock

@@ -1,8 +1,8 @@
 GIT
   remote: https://github.com/evazion/dtext_rb.git
-  revision: 10eb812783fbb21837aaaa35807ef7b9a0b88269
+  revision: f7e398393e6149d2c3d122cbb7659039792391a1
   specs:
-    dtext_rb (1.10.0)
+    dtext_rb (1.10.1)
       nokogiri (~> 1.8)
 
 GIT

app/javascript/src/styles/common/dtext.scss

@@ -100,7 +100,7 @@ div.prose {
     }
   }
 
-  a.dtext-external-link::after {
+  a.dtext-named-external-link::after {
     // https://fontawesome.com/icons/external-link-alt?style=solid
     @include fa-solid-icon("\f35d");