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-register-plugin.md

@@ -0,0 +1,110 @@
+registerPlugin()
+
+dynamically register plugins
+
+Description
+===========
+
+void
+
+registerPlugin
+
+string
+
+type
+
+string
+
+name
+
+mixed
+
+callback
+
+bool
+
+cacheable
+
+mixed
+
+cache\_attrs
+
+This method registers functions or methods defined in your script as
+plugin. It uses the following parameters:
+
+-   `cacheable` and `cache_attrs` can be omitted in most cases. See
+    [controlling cacheability of plugins output](#caching.cacheable) on
+    how to use them properly.
+
+<!-- -->
+
+
+    <?php
+    $smarty->registerPlugin("function","date_now", "print_current_date");
+
+    function print_current_date($params, $smarty)
+    {
+      if(empty($params["format"])) {
+        $format = "%b %e, %Y";
+      } else {
+        $format = $params["format"];
+      }
+      return strftime($format,time());
+    }
+    ?>
+
+       
+
+And in the template
+
+
+    {date_now}
+
+    {* or to format differently *}
+    {date_now format="%Y/%m/%d"}
+
+
+    <?php
+    // function declaration
+    function do_translation ($params, $content, $smarty, &$repeat, $template)
+    {
+      if (isset($content)) {
+        $lang = $params["lang"];
+        // do some translation with $content
+        return $translation;
+      }
+    }
+
+    // register with smarty
+    $smarty->registerPlugin("block","translate", "do_translation");
+    ?>
+
+       
+
+Where the template is:
+
+
+    {translate lang="br"}Hello, world!{/translate}
+
+       
+
+
+    <?php
+
+    // let's map PHP's stripslashes function to a Smarty modifier.
+    $smarty->registerPlugin("modifier","ss", "stripslashes");
+
+    ?>
+
+In the template, use `ss` to strip slashes.
+
+
+    <?php
+    {$var|ss}
+    ?>
+
+See also [`unregisterPlugin()`](#api.unregister.plugin), [plugin
+functions](#plugins.functions), [plugin block
+functions](#plugins.block.functions), [plugin compiler
+functions](#plugins.compiler.functions), and the [creating plugin
+modifiers](#plugins.modifiers) section.