fix: updated css resets; changed footer element

[davidruvolo51]

What are the main changes you did:

In PR #3683, the primary router view was changed to a <main> element and a primary <footer> element was added. This was important for other reasons listed in the PR. As a result, a few changes to molgenis-viz library is needed. These are -

• Update resets.scss: need to be make sure the css selector points to the main element
• Remove footer element generated by the <PageFooter> component.

how to test:

• navigate to the preview.
• in the pet store schema, navigate to any of the dashboard apps. (e.g., pet store/gportal, pet store/cranio-public, etc.)
• There should be: 1) no more left and right padding, 2) the custom footer should be displayed instead of the default molgenis one

todo:

• updated docs in case of new feature
• added/updated tests
• added/updated testplan to include a test for this fix, including ref to bug using # notation

[sonarcloud]

Quality Gate passed

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