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?

Start with wiki/Seq.md and inspect its YAML front matter, especially the title and permalink fields, then review the other wiki pages for the same pattern. Check how the theme renders the title on the page. Done means the wiki pages have more descriptive, user-friendly title strings while their permalinks remain unchanged.

Escrita pelo modelo de indexação a partir do texto da issue.