Feature/add docs (#689)

* Add converted docs repo

* Set theme jekyll-theme-minimal

* Removed BC docs, added TOC

* Added TOCs, rewrote most important links in documentation. Linked README to new Github Pages site

* some link fixes

docs/programmers/api-functions/api-unregister-plugin.md

@@ -0,0 +1,36 @@
+unregisterPlugin
+
+dynamically unregister plugins
+
+Description
+===========
+
+void
+
+unregisterPlugin
+
+string
+
+type
+
+string
+
+name
+
+This method unregisters plugins which previously have been registered by
+[registerPlugin()](#api.register.plugin), It uses the following
+parameters:
+
+<!-- -->
+
+
+    <?php
+
+    // we don't want template designers to have access to function plugin "date_now" 
+    $smarty->unregisterPlugin("function","date_now");
+
+    ?>
+
+       
+
+See also [`registerPlugin()`](#api.register.plugin).