docs: add Related Work page listing migration safety tools (#707)

Author: flvmnt

docs/reference/related_work.md

@@ -0,0 +1,16 @@
+# Related Work
+
+Several tools address migration safety and schema change management for PostgreSQL.
+
+Some of our [lint rules are ported from these tools](./rule_sources.md).
+
+## Migration Safety
+
+- [**Eugene**](https://github.com/kaaveland/eugene) - Lint and trace lock behaviour of SQL migrations for PostgreSQL
+- [**Squawk**](https://github.com/sbdchd/squawk) - Linter for PostgreSQL migrations and SQL
+- [**pgfence**](https://github.com/flvmnt/pgfence) - PostgreSQL migration safety CLI with lock mode analysis, risk scoring, and safe rewrite recipes
+- [**Strong Migrations**](https://github.com/ankane/strong_migrations) - Catch unsafe migrations in development (Ruby / ActiveRecord)
+
+## Migration Execution
+
+- [**pgroll**](https://github.com/xataio/pgroll) - PostgreSQL zero-downtime migrations made easy

mkdocs.yml

@@ -37,6 +37,7 @@ nav:
       - Linter Rule Sources: reference/rule_sources.md
       - Database Linter Rules: reference/database_rules.md
       - Database Linter Rule Sources: reference/database_rule_sources.md
+      - Related Work: reference/related_work.md
       - Environment Variables: reference/env_variables.md
 
 plugins: