import solid as external to fix testing with npm

When installing the solid-start with-vitest template using npm, you get an error message on tests:

stderr | file://vitest-project/node_modules/solid-js/dist/dev.js:1932:13
You appear to have multiple instances of Solid. This can lead to unexpected behavior.

stderr | src/components/Counter.test.tsx > <Counter /> > increments value
computations created outside a `createRoot` or `render` will never be disposed

This is because npm imports work differently than pnpm imports and vitest does resolve the indirectly included modules using the package manager's resolver. Importing everything solid-js as external fixes this issue.

solidjs / vite-plugin-solid

import solid as external to fix testing with npm #152

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