removed dependencies incompatible with windows and added altair vega-…

[salva-u]

added altair
dash-vega-components

[AReyH]

Looks good, but I don't think we are using Altair anymore, right?

[salva-u]

Looks good, but I don't think we are using Altair anymore, right?
this code chunk still uses it, I merged the test_app and app into one, I might have kept the older version in? or not sure this is referenced later or not, don't wanna remove it and break things, let's just keep it?
python race_pol_party_chart1 = alt.Chart(df_pct).mark_bar().encode( x=alt.X('race', axis=alt.Axis(title='Race')), y=alt.Y('percentage:Q', axis=alt.Axis(format='%'), stack='normalize', title='Percentage'), color=alt.Color('political_party', legend=alt.Legend( title='Political Party')) ).properties( title='100% Stacked Bar Chart of Political Party by Race' )
@AReyH

[salva-u]

please check comment regarding altair

[AReyH]

I can check in a bit, but I deleted the Altair graph, because I replicated it with Plotly. I'll check and see if we're using Altair.

[salva-u]

let's do that on a different branch, we can merge the current to PRs, if everything is good, and you can create a new issue for altair fix?

[Sampsonyu]

LGTM