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/designers/language-modifiers/language-modifier-string-format.md

@@ -0,0 +1,39 @@
+string\_format {#language.modifier.string.format}
+==============
+
+This is a way to format strings, such as decimal numbers and such. Use
+the syntax for [`sprintf()`](&url.php-manual;sprintf) for the
+formatting.
+
+   Parameter Position    Type    Required   Default  Description
+  -------------------- -------- ---------- --------- ---------------------------------------
+           1            string     Yes       *n/a*   This is what format to use. (sprintf)
+
+
+    <?php
+
+    $smarty->assign('number', 23.5787446);
+
+    ?>
+
+       
+
+Where template is:
+
+
+    {$number}
+    {$number|string_format:"%.2f"}
+    {$number|string_format:"%d"}
+
+       
+
+Will output:
+
+
+    23.5787446
+    23.58
+    23
+
+       
+
+See also [`date_format`](#language.modifier.date.format).