update README.org.template to the new convention

Remove #+HTML_HEAD_EXTRA: <link ... /readtheorg.css" />

:TOC_4_org:noexport: -> :TOC_4_gh:noexport:

Author: JAremko

core/templates/README.org.template

@@ -1,13 +1,12 @@
 #+TITLE: %LAYER_NAME% layer
-#+HTML_HEAD_EXTRA: <link rel="stylesheet" type="text/css" href="../css/readtheorg.css" />
 
 # The maximum height of the logo should be 200 pixels.
 [[img/%LAYER_NAME%.png]]
 
-* Table of Contents                                        :TOC_4_org:noexport:
- - [[Decsription][Description]]
- - [[Install][Install]]
- - [[Key bindings][Key bindings]]
+* Table of Contents                                        :TOC_4_gh:noexport:
+ - [[#decsription][Description]]
+ - [[#install][Install]]
+ - [[#key-bindings][Key bindings]]
 
 * Description
 This layer does wonderful things: