Gitpod is activated as a button straight in the Github repository :
Get Gitpod here by adding this Chrome or Firefox extension : https://www.gitpod.io/docs/browser-extension/
.gitpod.Dockerfile : Dockerfile for Gitpod, configured with Salesforce container
.gitpod.yml : VS Code extensions for SFDX
VS Code remote development for SFDX : https://github.com/forcedotcom/vscode-remote-try-sfdx/tree/master/.devcontainer
Gitpod configuration : https://www.gitpod.io/docs/configuration/