Use gitpod

Use gitpod to an option to setup.

Needs to change all `Setup.md` from exercises and explain the usage from Gitpod.

Needs to change all Makefiles and verify if users is using gitpod and show the link to the "localhost" inside Gitpod.
```bash
# to verify
$ whoami
gitpod
$ gp url <port>
https://<port>-globocom-secdevlabs-1qppj14zvqu.ws-us67.gitpod.io/
```