Document deploy --watch

[bryannho]

Closes #55

• Added description and instruction for deploy --watch in cli.md
• Updated instructions in github.md to include --watch in the ploomber-cloud.yaml file by default. Included description of how to remove it, and how that would change the behavior.
• Will open a PR to add --watch to the ploomber-cloud template
• I haven't updated the image of the logs in the github actions guide but I can. Let me know if I should do that.

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📚 Documentation preview 📚: https://ploomber-doc--56.org.readthedocs.build/en/56/

[edublancas]

please update the image , we can keep the version without --watch and include one that shows how the logs look like when passing --watch

[bryannho]

please update the image , we can keep the version without --watch and include one that shows how the logs look like when passing --watch

@edublancas replaced the image here. i put the version with --watch first because it's in the sample yaml by default, then after it i put the version without --watch