Remove unused methods in lib/taggable.rb, plus three that should've been unused

Description

taggable has several unused methods that can be removed:

The following method is currently used to list the fandom tags on external works, but should be changed and removed:

The following methods are current used to show tags on series blurbs when the user has tag-hiding preferences enabled, but the code should be updated and the methods removed:

Testing

Environment

None

Status

Assignee

Sarken

Reporter

Sarken

Roadmap

Misc

Priority

Medium

Affects versions

Fix versions

Components

BackEnd

Difficulty

Easy

Required Access Level

None

Milestone

Internal 0.9
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