Indexing Ignores Pictograms

This patch fixes the indexing pipeline that has been failing for Seattle for a while: https://github.com/CouncilDataProject/seattle-staging/actions?query=workflow%3A%22Event+Index%22

The bug was caused by a pictogram / emoji in the transcript, as such, during indexing, we strip all pictogram like characters:
bugfix/clean-pictograms-from-transcripts-before-indexing by @JacksonMaxfield in #165