fix(docs): document the --zip flag in the plasmo build CLI

[timrogers]

Details

The plasmo build CLI supports a --zip flag which builds your extension and then packages it into a ZIP file.

This is mentioned in the Plasmo docs, but not in the in-CLI help, which I found confusing.

This adds it to the help output, in the process splitting the documentation for the dev and build commands.

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• I agree to license this contribution under the MIT LICENSE
• I checked the current PR for duplication.

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[timrogers]

After this change, the output looks like this:

🟣 Plasmo v0.88.0
🔴 The Browser Extension Framework
🟠 CMDS   | help | start | init | dev | build | package | version | -v | --version
🟡 OPTS   |

    init

      --entry                     entry files (default: popup)
      --with-<name>               use an example template

    dev

      --target [string]           set the target (default: chrome-mv3)
      --tag [string]              set the build tag (default: dev or prod depending on NODE_ENV)
      --src-path [path]           set the source path relative to project root (default: src)
      --build-path [path]         set the build path relative to project root (default: build)
      --entry                     entry point name (default: popup)
      --env                       relative path to top-level env file

    build

      --target [string]           set the target (default: chrome-mv3)
      --tag [string]              set the build tag (default: dev or prod depending on NODE_ENV)
      --src-path [path]           set the source path relative to project root (default: src)
      --build-path [path]         set the build path relative to project root (default: build)
      --entry                     entry point name (default: popup)
      --env                       relative path to top-level env file
      --zip                       zip the build output

[louisgv]

LGTM 👍