Linkify community and user names

This commit makes user and community names clickable in post/comments. Closes #71?

build.gradle

@@ -9,6 +9,7 @@ buildscript {
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:7.4.2'
+        classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:1.8.20'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files