Added Homelessness in Manchester page

[jameshale14]

- Summary Added "Homelessness in Manchester" page as per issue #8 The background photo is the same as the one used for the "Homelessness Strategy" page, as this is what the page is based off, so that might need changing. I pulled a couple of quotes out to break up the text - I'm not sure if there's a particular style guide for these so they might want formatting differently.

- Test plan I couldn't find any automated tests, so here's some screenshots of the page running at http://localhost:3000/homelessness-in-manchester/:

- Description for the changelog

Created markdown and layout files for the "Homelessness in Manchester" page

- A picture of a cute animal (not mandatory but encouraged)

[vincelee888]

haha, thanks for the extensive PR details - that was just forked from the original template :D