More user-friendly page titles

Currently all the YAML header sections have the original wiki page name as their title, e.g.

http://biopython.org/wiki/Seq
https://github.com/biopython/biopython.github.io/blob/master/wiki/Seq.md

```

---
title: Seq
permalink: wiki/Seq
layout: wiki
tags:
- Wiki Documentation

---
```

We could go over all the pages and expand the `title:` strings to be more user-friendly - these will get rendered on the page via the theme.

e.g. here maybe "The sequence object, Seq" or something like that might be better?