update documentation URLs to reflect EoL of onica.com

[ITProKyle]

Summary

Note

• https://www.rackspace.com/newsroom/rackspace-acquire-onica-cloud-native-consulting-and-managed-services-company
• https://www.rackspace.com/onica

Update documentation URLs to reflect the EoL of onica.com.
This also migrates our documentation from Read the Docs for Business to Read the Docs Community.

What Changed

Changed

• replaced docs.onica.com/projects/runway with runway.readthedocs.io

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.13%. Comparing base (1620a5d) to head (38fd548).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2484   +/-   ##
=======================================
  Coverage   90.13%   90.13%           
=======================================
  Files         247      247           
  Lines       15610    15610           
=======================================
  Hits        14070    14070           
  Misses       1540     1540           

Files	Coverage Δ
runway/_cli/commands/_docs.py	100.00% <100.00%> (ø)
runway/_cli/commands/_new.py	100.00% <ø> (ø)
runway/_cli/main.py	100.00% <ø> (ø)
runway/cfngin/blueprints/base.py	100.00% <ø> (ø)
runway/utils/__init__.py	71.75% <100.00%> (ø)

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