feat : Add Idyll clean option

[amitbadala]

• Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  Feature update.

• What is the current behavior? (You can also link to an open issue here)
  Addresses idyll clean #533

• What is the new behavior (if this is a feature change)?
  Idyll clean option can be used to remove .idyll folder

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)
  No.

• Other information:

[amitbadala]

[mathisonian]

Thanks @amitbadala! This is looking good. One thing I'd want to add before merging:

The idyll folder can contain a secret token that is used to deploy projects to https://idyll.pub. I think this command should check for the existence of such a file (.idyll/token) and if it exists show a warning message along the lines of

"This command will remove the idyll cache folder, including your idyll.pub token. Subsequent deploys to idyll.pub will receive a new URL. Are you sure you wish to continue?"

[amitbadala]

[mathisonian]

Left one small nitpick, otherwise looks good to go! I'll merge once that final tweak is made

[mathisonian]

@amitbadala can you please avoid force pushing to PRs? You can push commits as you work and I'll squash them during the merge if necessary.

[amitbadala]

@amitbadala can you please avoid force pushing to PRs? You can push commits as you work and I'll squash them during the merge if necessary

my bad !.. would ensure that it's not repeated

[mathisonian]

Looking great, thanks @amitbadala