chore: add demo

[ncclementi]

Ok, I cut couple of lines we were running in the original demo, and introduced

• .rename()
• .sql()
• add a simple udf example

TODO:

• [ ] add parquet files in container @gforsyth

import ibis

basics = ibis.examples.imdb_title_basics.fetch()
ratings = ibis.examples.imdb_title_ratings.fetch()

basics.to_parquet("imdb_title_basics.parquet")
ratings.mutate(
    averageRating=t.averageRating.cast("str"), numVotes=t.numVotes.cast("str")
).to_parquet("imdb_title.ratings.parquet")

• [ ] add postgres and mysql (or other) con @cpcloud

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[cpcloud]

Going to remove the English demo page for now to reduce a bit of clutter and then merge this!