Include a speaking/deputation guide

These exist in a few places. We could link out at first, but should probably work on our own guide on the site itself.
### Resources
- https://witopoli.com/resources/deputation-guide/
- http://tyfpc.ca/whatwedo/advocacytoolkit/publicdeputation/
- http://publicspaces.ca/how-to-make-a-deputation-at-city-hall/
- http://www.torontoenvironment.org/make_a_deputation

Start by reviewing the four linked deputation resources and the repository's existing site content to find the appropriate place for this guide. Done means the site provides either a useful guide or clearly links to the selected resources, with the scope of that choice documented.

Written by the indexing model from the issue text.