Simplifying back button text and removing unused functions

[wesruv]

Back button text did not need extra markup, other than the surrrounding button. Moved it to a internal property.
Removed unused functions made during original development, but are now unused
Updated Demo HTML, thought text in 'details' was a bug in functionality, but was content in the slot. Hopefully the slight adjustment makes that more clear.

Related issues

• (switching from .compiled.js to .umd.js #100) Description of issue

Preview

Link(s) to demo page(s) where this element can be viewed:

• Link

What has changed and why

Testing instructions

• Test case upgraded storybook to the latest alpha release and added a command fo… #1
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• Test case adding command for new RHElement using generator-rhelement #2
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  2. Do this

Browser requirements

Your component should work in all of the following environments:

• Latest 2 versions of Edge
• Internet Explorer 11 (should be useable, not pixel perfect)
• Latest 2 versions of Firefox (one on Mac OS, one of Windows OS)
• Firefox 78 (or latest version for Red Hat Enterprise Linux distribution)
• Latest 2 versions of Chrome (one on Mac OS, one of Windows OS)
• Latest 2 versions of Safari
• Android mobile device (such as the Galaxy S9)
• Apple mobile device (such as the iPhone X)
• Apple tablet device (such as the iPhone Pro)

Ready-for-merge Checklist

• Expected files: all files in this pull request are related to one request or issue (no stragglers or scope-creep).
• Tests have been updated to cover these changes.
• Browser testing passed.
• Changelog updated.
• Documentation (README.md, WHY.md, etc.) updated or added.
• Link to the demo recording:
• Approved by designer.

Merging

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