BE | Refactor to add Puzzle Status = Permanently Removed

[MelTravelz]

Changes:

• Added model enums & test for Puzzle Status = 3 "Permanently Removed"
• Added UserPuzzles#update test to confirm Puzzle Status can be updated to: "Permanently Removed"
• Added test to confirm Loan cannot be created when Puzzle Status: "Permanently Removed"
• Updated action & wrote test to confirm Puzzels#index will not return puzzles with status: "Permanently Removed"

NOTE: actions still need major refactor... this PR's purpose is to allow a puzzle status to be "Permanently Removed"

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This is related to #

This closes #60

[] I linted my work. (RuboCop)

[X] I've updated documentation & README. (if necessary)

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