Tracking: Launchpad: Desired Documentation Improvements

[chriswessels]

• [x] A section describing which blockchains are officially supported by GraphOps
• [x] A section describing how a user can use Launchpad to deploy "unsupported chains"/custom releases
• [x] A section describing stable vs canary release channels and how versions move through them
• [x] Examples of following stable, following canary, and running a custom image tag
• [x] A section describing the different ways to use launchpad (without starter, without helmfile)

[chriswessels]

https://github.com/graphops/docs/pull/74 merged which covers:

• [x] A section describing which blockchains are officially supported by GraphOps
• [x] A section describing how a user can use Launchpad to deploy "unsupported chains"/custom releases