Remove `Either` documentation page #2373

Job	Run time
Validate Steward Config (ubuntu-latest)	12s
Generate Site (ubuntu-latest, temurin@8)	3m 48s
Scalafix (ubuntu-latest, 2.13.11, temurin@8)	56s
Build and Test (ubuntu-latest, 2.12.18, temurin@8, rootJS)	10m 2s
Build and Test (ubuntu-latest, 2.12.18, temurin@8, rootJVM)	10m 13s
Build and Test (ubuntu-latest, 2.12.18, temurin@8, rootNative)	26m 9s
Build and Test (ubuntu-latest, 2.13.11, temurin@8, rootJS)	12m 50s
Build and Test (ubuntu-latest, 2.13.11, temurin@8, rootJVM)	13m 23s
Build and Test (ubuntu-latest, 2.13.11, temurin@8, rootNative)	32m 5s
Build and Test (ubuntu-latest, 2.13.11, temurin@17, rootJVM)	8m 29s
Build and Test (ubuntu-latest, 2.13.11, graalvm@11, rootJVM)	6m 20s
Build and Test (ubuntu-latest, 3.3.0, temurin@8, rootJS)	15m 14s
Build and Test (ubuntu-latest, 3.3.0, temurin@8, rootJVM)	14m 25s
Build and Test (ubuntu-latest, 3.3.0, temurin@8, rootNative)	27m 37s
Publish Artifacts	0s
	3h 1m 43s

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