[Feature] Implements a scroll-to-top element for longer page contexts

[egbadon-victor]

Fixes

• Fixes [Feature] Add a scroll-to-top element to UX for longer page contexts #54 by @possumbilities

Description

This PR implements a scroll-to-top element, which fixes the accessibility issue of going back to the top on a long page.

Technical details

• Implements scroll-to-top class in the vocabulary.css file
• Implementation is demoed on the archive-page.html file in the context folder

Tests

• Launch the archive-page.html file on your preferred browser and scroll
• Test that the scroll-to-top button is hidden until you scroll some distance
• Test that the scroll-to-top button is not visible on screens less than 700px
• Verify that there is no JS involved in this implementation

Screenshots

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
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• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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[possumbilities]

Hi and thanks for this!

In addition to the changes listed above, the button is flush to the right edge and should instead be aligned further into and possibly over the content area.

The button also needs to be an element that could occur within the HTML of every page, but only become visible on longer pages. Please see the original Issue on the mention of pseudo classes to obscure the element.

CSS pseudo elements using z-index stack positions and variable percentage based heights would offer a means to "reveal" the button after a degree of scrolling, and to visually hide the element on pages which do not reach a particular length.

[egbadon-victor]

@possumbilities thank you for taking your time to review this PR. I have noted all changes and concerns. I will get to work on implementing them Immedidately

[egbadon-victor]

@possumbilities I have implemented all feedback given.

I have also implemented it in such a way to it can be added to any page implementing vocabulary. It is hidden on shorter pages, and appears on longer pages without the use of JS.

I have also implemented it in all specimens, and updated the docs/index.html file to reflect and addition of a new component.