Add .npmrc file back to restore deploys

[Peeja]

Deploys appear to have broken because cecec35#diff-e813096d69c49812e40e00be9ac8fa14d77f0ec1f97ab4c45cb096b3bedd35de deleted the .npmrc.

• Related issue: E404 Not Found - PUT for published packages changesets/action#98
• One repo's solution: https://github.com/pantheon-systems/decoupled-kit-js/pull/612/files (adds .npmrc to the repo)
• Another repo's solution: https://github.com/meilisearch/meilisearch-js-plugins/pull/983/files (adds .npmrc during CI run)

We do have NPM_TOKEN in the env, but we also need //registry.npmjs.org/:_authToken=${NPM_TOKEN} in .npmrc by the time changesets runs.

Fixes #306

[changeset-bot]

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Latest commit: 2af9591

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[JounQin]

Thanks.

v3.6.3 released.