Link to SchemaVer blog post

What does this MR do?

Fix link to SchemaVer, link to original blog post: https://snowplow.io/blog/introducing-schemaver-for-semantic-versioning-of-schemas/

Alternatively we could redirect to https://docs.snowplow.io/docs/pipeline-components-and-applications/iglu/common-architecture/schemaver/

What are the relevant issue numbers?

None

Checklist

• Ensure changes can be built upon without requiring a breaking change, see Building for Extensibility.
• Review and add/update tests for this feature/bug.
• Add an entry to the CHANGELOG if required, with the appropriate version. See Classifying Changes.
• Assign the MR to the appropriate person/people for review.