README.md: Fix Test Template and NetworkingDsc Links

[X-Guardian]

Pull Request (PR) description

This PR fixes the links in the README for the Test Templates and the NetworkingDsc Repo

This Pull Request (PR) fixes the following issues

• Fixes #314

Task list

• [ ] 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.
• [ ] Comment-based help added/updated for all new/changed functions.
• [ ] Localization strings added/updated in all localization files as appropriate.
• [ ] Unit tests added/updated.
• [ ] New/changed code adheres to DSC Resource Style Guidelines and Best Practices.

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This change is 

[codecov-io]

Codecov Report

Merging #327 into dev will not change coverage. The diff coverage is n/a.

@@         Coverage Diff         @@
##            dev   #327   +/-   ##
===================================
  Coverage    75%    75%           
===================================
  Files        12     12           
  Lines      1581   1581           
  Branches      2      2           
===================================
  Hits       1186   1186           
  Misses      393    393           
  Partials      2      2

[johlju]

@gaelcolas or @PlagueHO please merge this one.