docs: update getting started guide and sandbox example for custom theme usage · trendmicro-frontend/tonic-ui@1900ca3

Build & Test: packages/theme/src/__tests__/createTheme.test.js#L3

Arrow function has too many lines (246). Maximum allowed is 200

Build & Test: packages/theme/src/__tests__/createTheme.test.js#L264

Arrow function has too many lines (246). Maximum allowed is 200

Build & Test: packages/styled-system/src/__tests__/sx.test.js#L280

Arrow function has too many lines (312). Maximum allowed is 200

Build & Test: packages/react-hooks/src/useHydrated.js#L12

useState call is not destructured into value + setter pair

Build & Test: packages/react/src/checkbox/CheckboxControlBox.js#L14

Arrow function has too many lines (208). Maximum allowed is 200

Build & Test: packages/react/src/date-pickers/Calendar/Calendar.js#L49

Arrow function has too many lines (241). Maximum allowed is 200

Build & Test: packages/react/src/scrollbar/Scrollbar.js#L23

Arrow function has too many lines (509). Maximum allowed is 200

Build & Test: packages/react/src/table/__tests__/Table.test.js#L16

Arrow function has too many lines (416). Maximum allowed is 200

Build & Test: packages/react/src/tabs/styles.js#L4

Arrow function has too many lines (302). Maximum allowed is 200

Build & Test: packages/react/src/toast/__tests__/Toast.test.js#L133

Prop `data-testid` must be placed on a new line

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