Complete Support for Composite Resources in Wiki pages

[PlagueHO]

Pull Request

Pull Request (PR) description

This PR adds support for composite resources to New-DscResourceWikiPage.

This Pull Request (PR) fixes the following issues

• Fixes #79

Task list

• [x] Added an entry to the change log under the Unreleased section of the file CHANGELOG.md. Entry should say what was changed and how that affects users (if applicable), and reference the issue being resolved (if applicable).
• [x] Documentation added/updated in README.md.
• [x] Comment-based help added/updated.
• [x] Localization strings added/updated in all localization files as appropriate.
• [x] Examples appropriately added/updated.
• [x] Unit tests added/updated.
• [x] Integration tests added/updated (where possible).
• [x] New/changed code adheres to DSC Community Style Guidelines.

@johlju - would you mind reviewing for me when you have time?

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This change is 

[codecov[bot]]

Codecov Report

Merging #97 (fdc2b99) into main (dd65819) will increase coverage by 0%. The diff coverage is 100%.

@@        Coverage Diff         @@
##           main   #97   +/-   ##
==================================
  Coverage    97%   98%           
==================================
  Files        38    40    +2     
  Lines       895   949   +54     
==================================
+ Hits        877   931   +54     
  Misses       18    18           

[johlju]

@PlagueHO awesome work! Just one comment, that I could see.