Update README.md

env.example

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+### Server Variables ###
+# Convex
+CONVEX_SELF_HOSTED_URL=
+CONVEX_SELF_HOSTED_ADMIN_KEY=
+NEXT_PUBLIC_CONVEX_URL=
+SETUP_SCRIPT_RAN=
+# Sentry
+SENTRY_AUTH_TOKEN=
+
+### Client Variables ###
+# Next                  # Default Values:
+NEXT_PUBLIC_SITE_URL='http://localhost:3000'
+# Sentry                           # Default Values
+NEXT_PUBLIC_SENTRY_DSN=
+NEXT_PUBLIC_SENTRY_URL=
+NEXT_PUBLIC_SENTRY_ORG=
+NEXT_PUBLIC_SENTRY_PROJECT_NAME=
+