Fix search bar breaking landing page

[nebudev14]

Was checking out the Jams website and noticed the search bar on the landing page crashes when any input is given to it.

Lines 518-530 on index.js seem to be the root issue, where jam doesn't exist.

searchLunr(query, props.jamsContent.batches.filter(batch => {

        if (batch.keywords.split(', ').includes('Beta')) {
          return false
        }
        if (
          !selectedCategories.some(keyword =>
            batch.keywords.split(', ').includes(keyword)
          ) &&
          selectedCategories != ''
        ) {
          return false
        }
}

Based on the code from the same file in lines 479-516, I'm assuming this was just a keyword mistake and they meant to check batch instead of jam. I've changed it in this pull request.

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