Fix #337 readme.md urls
Fix #337 readme.md urls

* Update the Canon SVG URL
* Replace the BrighterCommand.github.io/Brighter references to github.com/BrighterCommand/Brighter
* Update the Documentation links to include introduction, readthedocs.io and wiki references

BrighterCommand/Paramore.Brighter,BrighterCommand/Paramore.Brighter,BrighterCommand/Brighter,BrighterCommand/Brighter,BrighterCommand/Brighter