chore: migrate charter to BigBang product

CODEOWNERS

charter/BigBang.md

charter/BigBangPackages.md

charter/DevCIWorkflow.md

charter/GitOpsEngine.md

charter/Glossary.md

charter/NewPackageRequests.md

charter/PackageOwner.md

charter/PackageRequirements.md

charter/README.md

charter/ReleaseProcess.md

charter/Scratch.md

charter/SprintPlanning.md

charter/Support.md

charter/TeamRhythm.md

charter/Teams.md

charter/Testing.md

charter/VendorDistroIntegration.md

charter/diagrams/dev_ci_workflow.drawio

charter/imgs/communication.png