Development & build process fix and various other amendments

Sorry, should have probably split this out looking back, I've added a checklist of the amendments below:

- [x] deploy with grunt-gh-pages (#43)
- [x] remove various un-required files
- [x] amend intro page installation instructions (#46)
- [x] replace Gregor's image (#33)
- [x] added a coming soon merchandise section (#48)
- [x] update readme with build/deploy process
- [x] add subtitle to title tag
- [x] remove .html from links

Other things which could be worth doing:

- [ ] serve static files from CDN (can be done for free with Cloudflare)
- [ ] concat vendor css & js in with hoodie files, e.g. jQuery & Mailchimp
- [ ] E2E testing with http://nightwatchjs.org/