Removed Bubbles from site banners and vertically aligned images that …

[seanmilfort]

…were surrounded by bubbles. Removed the word Test that was previously typed on README to check if Sean Milfort had access to write to repo.

Please always provide the GitHub issue(s) your PR is for, as well as test URLs where your change can be observed (before and after):

Fix #184

Test URLs:

• Before: https://main--elixirsolutions--hlxsites.hlx.live/
• After: https://184-remove-bubbles--elixirsolutions--hlxsites.hlx.live/

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[sforschen]

columns.css

@seanmilfort some additional changes

change 50px to var(--default-content-gap)

Marketing requested the remaining images to be bigger so we need to change the minimum of 280px to 352px and 320px to 352px

I will need to go in and upload new pictures that are bigger than 280px

In this page https://184-remove-bubbles--elixirsolutions--hlxsites.hlx.live/aboutus

I updated the careers section image to be bigger so you can see the effects when the code it changed

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