Possible solutions/approaches to creating table of contents:

HTML/CSS:looks pretty basic and simple
Highly Configurable jQuery Table of Contents Plugin - TocJS: possibly too complex, but I can have a look; shoot for the moon right?

I would do the simple one myself, but happy to defer to your wisdom and research here.

Update: need to use Rails routing to make this work.
e.g. <%= link_to('The text you want', anchor: '#the_id_you_want') %> transforms into
<li class="toc-li"><%=link_to('Introduction', anchor: '1toc') %></li>

Also found that # were not necessary for anchoring within id

Thanks @ruebot for the help!

Pages to update with routing template (including ToC list at top of page, "back to top" for each section)

• An Introduction to Gephi
• Network Graphing Archived Websites With Gephi
• Filtering the Full-Text Derivative File
• Text Analysis Part One
• Text Analysis Part Two
• Making Sense of the Domains Count