Switch to a new calendar component

[jlbooker]

NPM now complains:

npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: 'react-input-calendar@0.5.4',
npm WARN EBADENGINE   required: { npm: '^3.0.0' },
npm WARN EBADENGINE   current: { node: 'v18.12.1', npm: '8.19.2' }
npm WARN EBADENGINE }

It seems the react-input-calendar package hasn't been updated for newer npm/node/react versions. Investigate and switch to a maintained calendar component.