[openstreetmap/openstreetmap-website] Fix help page, grid card layout on mobile (#2534)

[Anton]

before: 
![image](https://user-images.githubusercontent.com/518939/74434850-f3626300-4e6b-11ea-8a56-702f8a1dc5a6.png)
 
after: 
![image](https://user-images.githubusercontent.com/518939/74434806-d9288500-4e6b-11ea-9440-2757e5df1b4e.png)

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/2534

-- Commit Summary --

  * fix help page, grid card layout on mobile

-- File Changes --

    M app/views/site/help.html.erb (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/2534.patch
https://github.com/openstreetmap/openstreetmap-website/pull/2534.diff

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