238 vessel page should show unique home port names only

[antwonthegreat]

Related Issue

Fixes #238

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[Sheeri]

Functions as requested, code looks good.

Here's the test case, looking good:

More examples: with duplicates for the vessels Gin Palace, HMS Jolly, HMS Mongo, Happy Days; and multiple empty strings for HMS Roger:

and in this build, they're all fixed:

[Sheeri]

Congratulations! 🎉 🙌 🎆 ㊗️

This PR is great and has been merged into the code. Thanks so much for contributing! If you'd like, you can request to work on another issue. We really appreciate your effort!