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-get-cache-dir.md

@@ -0,0 +1,23 @@
+getCacheDir()
+
+return the directory where the rendered template\'s output is stored
+
+Description
+===========
+
+string
+
+getCacheDir
+
+
+    <?php
+
+    // get directory where compiled templates are stored
+    $cacheDir = $smarty->getCacheDir();
+
+    ?>
+
+       
+
+See also [`setCacheDir()`](#api.set.cache.dir) and
+[`$cache_dir`](#variable.cache.dir).