[#341] Added disable and single icon flags to text-icon.

[alan-cole]

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• I have formatted the subject to include the issue number
  as [#123] Verb in past tense with a period at the end.
• I have provided information in the Changed section about WHY something was
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Changed

1. Added icon_group_disabled and icon_single_only flags to text-icon. This will allow for grouping to be disabled, and for external links to display in-place of icons.
2. Applied the use of the new settings to cards that were using non-standard styling of links with icons. They include: navigation-card, next-step, publication-card and subject-card.

Screenshots

[github-actions]

🚀 Deployed on https://66ff921890696cb91ba3697f--civictheme-uikit.netlify.app

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 13.87%. Comparing base (7315692) to head (3cd915e).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #403   +/-   ##
=======================================
  Coverage   13.87%   13.87%           
=======================================
  Files          27       27           
  Lines        1290     1290           
  Branches      307      307           
=======================================
  Hits          179      179           
  Misses        894      894           
  Partials      217      217           

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[richardgaunt]

Fixes #341

[richardgaunt]

@alan-cole Thanks this is a great solution