Updated examples (#2405)

* Updated examples

Signed-off-by: Kaloyan Nikolov <tzerber@gmail.com>

* Lock examples to PostgreSQL 16

Signed-off-by: Kaloyan Nikolov <tzerber@gmail.com>

* Pin postgresql to 16 in Readme example

Signed-off-by: Kaloyan Nikolov <tzerber@gmail.com>

* Update .examples/docker-compose/insecure/mariadb/apache/compose.yaml

Co-authored-by: J0WI <J0WI@users.noreply.github.com>
Signed-off-by: Kaloyan Nikolov <tzerber@gmail.com>

* Update .examples/docker-compose/insecure/postgres/apache/compose.yaml

Co-authored-by: J0WI <J0WI@users.noreply.github.com>
Signed-off-by: Kaloyan Nikolov <tzerber@gmail.com>

* Update .examples/docker-compose/insecure/mariadb/fpm/compose.yaml

Co-authored-by: J0WI <J0WI@users.noreply.github.com>
Signed-off-by: Kaloyan Nikolov <tzerber@gmail.com>

* Moved some comments on new lines.

Signed-off-by: Kaloyan Nikolov <tzerber@gmail.com>

* Moved another comment to new line

Signed-off-by: Kaloyan Nikolov <tzerber@gmail.com>

* Unified across files / updated README file.

Signed-off-by: Kaloyan Nikolov <tzerber@gmail.com>

* Use canonical links to external services.

Signed-off-by: Kaloyan Nikolov <tzerber@gmail.com>

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Signed-off-by: Kaloyan Nikolov <tzerber@gmail.com>
Co-authored-by: J0WI <J0WI@users.noreply.github.com>