fix: typo and ref to links

[mishraomp]

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Pull Request Overview

This PR fixes a typo and updates the reference to links in the README documentation regarding the PostGIS configuration in the Crunchy database setup.

• Corrected the description of enabling/disabling PostGIS in the README
• Updated the link reference text and example configuration for switching to standard PostgreSQL

Comments suppressed due to low confidence (1)

README.md:453

• The reference to the Helm chart values file changed from '.yaml' to '.yml'. Please verify that this change is intentional to maintain consistency across documentation.

PostGIS is enabled by default for geospatial data support when postGISVersion value is provided. To switch to standard PostgreSQL, update the `postGISVersion` field in the [Crunchy Helm chart values](./charts/crunchy/values.yml) to `~`. This disables PostGIS extensions, making it a plain PostgreSQL setup.