layout of README

README.md

@@ -1,7 +1,7 @@
 This repository includes tags and tag descriptions from StackExchange sites
 converted to knowledge organization systems in SKOS format.
 
-# Tags in StackExchange
+## Tags in StackExchange
 
 [StackExchange](http://stackexchange.com) is a network of Questions & Answers
 websites. Questions in each website are collaboratively [indexed by social
@@ -12,7 +12,7 @@ can be described with a short excerpt, a more detailed text, and they may have
 synonyms. Tags can be edited by the community. The content of all StackExhange
 websites, including tags and tag descriptions is licensed under CC-BY-SA.
 
-# Repository outline
+## Repository outline
 
     data/                     - downloaded and transformed tagging data
 
@@ -21,14 +21,14 @@ websites, including tags and tag descriptions is licensed under CC-BY-SA.
 
     lib/StackExchange/API.pm  - tiny wrapper of StackExchange API
 
-# From Tags to SKOS
+## From Tags to SKOS
 
 Although Jeff Atwood was [against hierarchical links between
 tags](http://blog.stackoverflow.com/2010/08/tag-folksonomy-and-tag-synonyms/#comment-48892),
 these relations are supported if given in a tag wiki with Unicode
 upwards/downwards arrows (↑/↓). Mappings to other knowledge organization
 systems are also added.
 
-# Example
+## Example
 
-![sample graph from libraries.stackexchange.com](samples/sample-graph.png)
+![sample graph from libraries.stackexchange.com](blob/master/samples/sample-graph.png)