docs(security): fix broken anchor in 1.28 and 1.29 (#176)

The trust model section of the security page links to an "Inline managed
roles" heading that only exists since 1.30 (`DatabaseRole`). It was
added by cloudnative-pg/cloudnative-pg#10811 and backported without that
feature. Link the page without the anchor. 1.28 and 1.29 are EOL, so the
fix lives here. Removes the two broken anchor warnings from `yarn
build`.

Signed-off-by: Marco Nenciarini <marco.nenciarini@enterprisedb.com>

Author: mnencia

website/versioned_docs/version-1.28/security.md

@@ -249,7 +249,7 @@ including:
 - the bootstrap SQL hooks `postInitSQL`, `postInitApplicationSQL`, and
   `postInitTemplateSQL`, executed as the `postgres` superuser at initialization
   (see [Executing Queries After Initialization](bootstrap.md#executing-queries-after-initialization));
-- [inline managed roles](declarative_role_management.md#inline-managed-roles)
+- [managed roles](declarative_role_management.md)
   (`spec.managed.roles`), which may set `superuser: true` or grant membership of
   existing roles, and can use PostgreSQL features such as `COPY ... FROM PROGRAM`
   to run commands inside the operand Pod;

website/versioned_docs/version-1.29/security.md

@@ -249,7 +249,7 @@ including:
 - the bootstrap SQL hooks `postInitSQL`, `postInitApplicationSQL`, and
   `postInitTemplateSQL`, executed as the `postgres` superuser at initialization
   (see [Executing Queries After Initialization](bootstrap.md#executing-queries-after-initialization));
-- [inline managed roles](declarative_role_management.md#inline-managed-roles)
+- [managed roles](declarative_role_management.md)
   (`spec.managed.roles`), which may set `superuser: true` or grant membership of
   existing roles, and can use PostgreSQL features such as `COPY ... FROM PROGRAM`
   to run commands inside the operand Pod;