`seamark:harbour:category=container` should be added

Definitely _not_ a marina (leisure=marina, seamark:harbour:category=marina), rather a seamark:harbour:category=container

“If the port area cannot be clearly specified, only one node should be set.” (see seamark:type=harbour)

Three nodes with this tag are located in close proximity to one another:
1. node/1805808529
2. node/1805809881
3. node/3121272256

There is an overlap of several objects that needs to be sorted out:
1. way/310851331
2. relation/4156017
3. relation/4156020