feat(cli): automatically load `.env` from current dir

[QuiiBz]

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Also automatically load .env from the current directory if we're specifying a path that is a file:

# Loads ./.env
lagon dev index.ts
# Loads ./.env
lagon dev src/index.ts
# Loads ./myproject/.env
lagon dev ./myproject

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🦋 Changeset detected

Latest commit: 40cff14c6d2fc9981c5b8aae5f060ff68280fd30

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ---------- | ----- | | @lagon/cli | Patch |

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