[openstreetmap-website] Add styling to make the /help page more approachable (#728)

[danstowell]

The /help page is a bit uninspiring - it hasn't had the imagery and styling that the signup page has recently received.

I hope that you'll find this pull request makes the page more approachable, more welcoming for those who need help. I think it also gives a bit more visual structure.
You can merge this Pull Request by running:

  git pull https://github.com/danstowell/openstreetmap-website help-page-style

Or you can view, comment on it, or merge it online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/728

-- Commit Summary --

  * Simple block styling for items on the /help page
  * Images and colours to brighten up the /help page

-- File Changes --

    A app/assets/images/help/help-illustration.png (0)
    A app/assets/images/help/help-illustration.svg (1422)
    A app/assets/images/help/welcome-illustration.png (0)
    A app/assets/images/help/welcome-illustration.svg (1193)
    A app/assets/images/help/wiki-illustration.png (0)
    A app/assets/images/help/wiki-illustration.svg (1212)
    M app/assets/stylesheets/common.css.scss (54)
    M app/views/site/help.html.erb (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/728.patch
https://github.com/openstreetmap/openstreetmap-website/pull/728.diff

---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/728
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