Fix: Correctly highlight initial Select value

[lukeed]

Both initial and cursor are 0 by default and index-based. Use the initial value to set the initial cursor position, which fixes the formatting.

Also added *.lock to gitignore to keep all yarn & package lock files out of repo~

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Closes #24

[tunnckoCore]

Why hiding lockfiles? And npm's is package-lock.json ;d

[lukeed]

Because they suck and weren't included to begin with. All they do is add noise in PRs.

[terkelg]

Thanks a lot @lukeed!