documentation has some outdated references

[Nils Andresen]

• There is a link to gitter, which should be replaced with discussions in cake-build/cake
• There are some references to --bootstrap which is no longer needed in Cake 1.0.0
• Examples page has a broken reference to parameters.md

[cake-contrib-bot]

🎉 This issue has been resolved in version 3.0.0 🎉
The release is available on:

• GitHub Release
• NuGet Package
  Your GitReleaseManager bot 📦🚀