Add ajheaps.github.io build to 'Older documentation' page

[sadielbartholomew]

During #34, it was realised it would be useful and pertinent to add a link to Andy's built documentation (for v3.3.0) to the 'Older documentation' page, as a link to the final generated copy under his user space, for persistency and to preserve the history, now that we have moved the docs to live under the NCAS-CMS GitHub user/org space.