make path optional

[stackoverfloweth]

Not sure why it took this long but I think path should have always been optional. This felt especially true when defining parent routes, or external routes

createExternalRoutes([
  {
    host: 'https://kitbag.dev',
    path: '',
    children: createExternalRoutes([
      {
        name: 'foo',
        path: 'child',
      },
    ]),
  },
])

After this PR, path behaves like query. It's never required and when omitted is assumed to be an empty string.

createExternalRoutes([
  {
    host: 'https://kitbag.dev',
    children: createExternalRoutes([
      {
        name: 'foo',
        path: 'child',
      },
    ]),
  },
])

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