Renamed main.tsx -> index.tsx for support in create-solid

[qsenn35]

Bug:

When using npm create solid and choosing Vanilla JS + tanstack options, it results in a index.html that contains a <script> with src="./src/main.tsx" rather than a valid .jsx file.

Reason:

In the solid-cli/create package we have this code in createVanillaJS():

writeFileSync(indexPath, (await readFile(indexPath)).toString().replace("index.tsx", "index.jsx"));

This will not pattern match with tanstack templates due to the name of the import being main.tsx instead of index.tsx resulting in an error when starting the project.

Fix:

Update the names in the Vanilla JS tanstack templates to contain index.tsx instead of main.tsx to allow the pattern matchup (and thus renaming) to work.

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From what I can tell, the only thing that really cares about the name of the entry point of tanstack related apps is the index.html and the solid create cli functions. Let me know if there's anywhere that needs changes due to the renaming, as I was not able to find any other places in this repo or others.

[qsenn35]

Also the reason I'm making the change here is purely because it seems weird to create an edge case handler in the solid-create package