hard code footer links for now

_includes/lesson_footer.html

@@ -2,7 +2,7 @@
   Footer for lesson pages.
 {% endcomment %}
 
-{% include gh_variables.html %}
+<!-- {% include gh_variables.html %} -->
 
 <footer>
   <div class="row">
@@ -33,14 +33,14 @@
 	<a href="{{repo_url}}/edit/{{ default_branch }}/{{page.path|replace: "_episodes", "_episodes_rmd" | replace: ".md", ".Rmd"}}" data-checker-ignore>Edit on GitHub</a>
 	{% endif %}
 	{% else %}
-	<a href="{{repo_url}}/edit/{{ default_branch }}/{{page.path}}" data-checker-ignore>Edit on GitHub</a>
+	<a href="{{repo_url}}/edit/{{ default_branch }}/{{page.path}}" data-checker-ignore>Edit source file</a>
 	{% endif %}
 	/
-	<a href="{{ repo_url }}/blob/{{ source_branch }}/CONTRIBUTING.md" data-checker-ignore>Contributing</a>
+	<a href="{{ repo_url }}/blob/{{ source_branch }}/contributing" data-checker-ignore>Contributing</a>
 	/
 	<a href="{{ repo_url }}/">Source</a>
-	/
-	<a href="{{ repo_url }}/blob/{{ source_branch }}/CITATION" data-checker-ignore>Cite</a>
+	<!-- /
+	<a href="{{ repo_url }}/blob/{{ source_branch }}/CITATION" data-checker-ignore>Cite</a> -->
 	/
 	<a href="mailto:{{ site.email }}">Contact</a>
     </div>