Create a glossary

* Content from Google document
Improve glossary copy

* Make copy more suitable for web
* Link to pages where appropriate
* Link between entries
* Improve readability
Refine glossary copy and provide examples

* Include clear examples of archives, redirects and sites
* Show HTTP statuses in a table
* Increase cross-linking between entries
* Clarify Path and Query parameter terms
Don't depend on example site having mappings
Merge pull request #188 from alphagov/glossary

Technical Glossary