fix: disable playground on production for graphql

[tanmoysrt]

Fixes #136

Describe the changes you have made in this PR -

• Added --dev flag which can be used to do some o/ps in development mode
• Graphql introspection and playground will be the only available in development mode

Note: Please check Allow edits from maintainers. before creating the PR.

[commit-lint]

Features

• added --dev flag to enable stuffs in development mode (cf5ded9)

Contributors

tanmoysrt

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