Let the browser deal with url changes when in BTR and using the CLI serve

[agubler]

Type: feature

The following has been addressed in the PR:

• There is a related issue
• All code has been formatted with prettier as per the readme code style guidelines
• Unit or Functional tests are included in the PR

Description:

In order to support on-demand BTR when not in static mode the link should let the browser deal with the routing navigation.

Related to dojo/cli-build-app#367

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[codecov]

Codecov Report

Merging #729 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #729   +/-   ##
=======================================
  Coverage   97.72%   97.72%           
=======================================
  Files         125      125           
  Lines        7485     7487    +2     
  Branches     1718     1719    +1     
=======================================
+ Hits         7315     7317    +2     
  Misses        170      170           

Impacted Files	Coverage Δ
src/routing/Link.ts	95.23% <100.00%> (+0.50%)	⬆️

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