Adds the ability to convert to html

Issue #14

I still want, at some point, to add to other formats but this is fine
for now.

The tool uses pandoc to do the conversion from md to html

A sample template (without any styling) is provided. This can be
overwritten in $HOME/.config/kb/templates/main.html or in the
knowledgebase directory under `templates`.

Makefile

@@ -9,6 +9,8 @@ install:
 	mkdir -p $(DESTDIR)$(PREFIX)/bin
 	sed '/^source/d' inc/* kb > $(DESTDIR)$(PREFIX)/bin/kb
 	chmod +x $(DESTDIR)$(PREFIX)/bin/kb
+	mkdir -p $(DESTDIR)$(PREFIX)/share/kb
+	cp -r templates $(DESTDIR)$(PREFIX)/share/kb
 
 
 uninstall: