Again audit rules that have already been added in TSLint

[JoshuaKGoldberg]

If they're in TSLint proper, remove them from the README.md & give a warning in the file for a version or two instead of checking the rule (before removing the file)?

[JoshuaKGoldberg]

Scrolling through file lists and READMEs...

Rules to remove:

• function-name: superseded by tslint's variable-name
• missing-jsdoc: superseded by tslint's file-header
• no-duplicate-case: superseded by tslint's no-duplicate-switch-case
• no-empty-interfaces: superseded by tslint's no-empty-interface
• no-reserved-keywords: superseded by tslint's no-reserved-keywords
• no-unnecessary-field-initialization: superseded by tslint's no-unnecessary-initializer
• prefer-array-literal: superseded by tslint's array-type
• prefer-type-cast: superseded by tslint's no-angle-bracket-type-assertion
• promise-must-complete: superseded by tslint's no-floating-promises
• react-tsx-curly-spacing: superseded by tslint-react's jsx-curly-spacing
• valid-typeof: superseded by tslint's typeof-compare, which was then superseded by the TS compiler