[openstreetmap/openstreetmap-website] Use bootstrap defaults for body CSS (#3239)

[Andy Allan]

This PR removes some of our overrides of basic CSS, which is handled through bootstrap. This reduces our custom CSS without having much impact on the rendered results. For example:

* color: `#222` -> `#212529`
* line-height: `1.6666` -> `1.5`;
* font-family: `'Helvetica Neue',Arial,sans-serif;` -> `-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji" !default;`

My plan with the body `font-size` is to tackle all of our font-size settings in one go as a separate PR.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/3239

-- Commit Summary --

  * Remove some default styling from body
  * Use bootstrap font family
  * Alight the max-width of the content to one of the bootstrap breakpoints

-- File Changes --

    M app/assets/stylesheets/common.scss (10)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/3239.patch
https://github.com/openstreetmap/openstreetmap-website/pull/3239.diff

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