Publish-WikiContent: Add Wiki Sidebar, Footer and WikiSource File Copy

[X-Guardian]

Pull Request (PR) description

This PR adds an auto-generated Sidebar and Footer to the Publish-WikiContent function, as well as copying any files within a WikiSource directory of the repo into the Wiki.

This Pull Request (PR) fixes the following issues

• Fixes #227
• Fixes #228

Task list

• [x] Added an entry under the Unreleased section of the change log in the CHANGELOG.md. Entry should say what was changed, and how that affects users (if applicable).
• [x] Documentation added/updated in README.md.
• [x] Comment-based help added/updated for all new/changed functions.
• [x] Localization strings added/updated in all localization files as appropriate.
• [x] Unit tests added/updated.
• [x] New/changed code adheres to DSC Resource Style Guidelines and Best Practices.

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This change is 

[codecov-io]

Codecov Report

Merging #335 into dev will increase coverage by <1%. The diff coverage is 100%.

@@         Coverage Diff          @@
##            dev   #335    +/-   ##
====================================
+ Coverage    79%    79%   +<1%     
====================================
  Files        12     12            
  Lines      1708   1733    +25     
  Branches      2      2            
====================================
+ Hits       1353   1378    +25     
  Misses      353    353            
  Partials      2      2

[johlju]

@X-Guardian Do you have an example on how this will look like in any of you public repos/forks?

[X-Guardian]

Yes. my fork of xActiveDirectory has its Wiki created from this function:

[johlju]

@PlagueHO must resolve his comment too, but at least this looks good to me. 🙂