Create streamlit app

[astrochun]

Closes #3

Commit history:

• Add etl module to fix CSV files
• Plots salary by college location using altair chart
• Add bokeh plotting to main.py
• Add fiscal year selectbox
• Remove college location multiselect
• Adjust fiscal year selectbox heading font size with markdown
• Add multiselect for college name
• Minor aesthetics for bokeh_histogram
• Fix x range to cut at 500k
• Add sidebar with selection tools
• Add bin_data function
• Refactor plotting for separate data view pages
• Add selectbox option for user-selected bin_size
• Add highest_earners_page function
• Move Common Statistics MD to specific pages
• Fix minor typos
• Generalized college_data_page() to work with departments
• Generalized get_summary_data function (dict input)
• Add common statistics to subset_select_data_page()
• Change bin size format to currency
• Fix type hint for bin_size
• Allow for college and individual dept selection
• Add college data to summary in department selection
• Distinguish between college and dept data in get_summary_data
• Add shebang
• Minor changes to wording
• Adjust get_summary_data to include location_flag
• Add checkbox to select all Colleges
• Switch from text_input to number_input in highest_earners_page
• Refactor code for more complex selection handling (part1)
• Refactor code for more complex selection handling (part2)
• Add documentation
• Add documentation for main()
• Only plot salary data if selection in place
• Alphabetical sorting of college_list
• Adjust markdown heading for each table for clarity
• PEP8 formatting
• Refactor histogram plotting to histogram_plot
• Reorder functions
• Add documentation to get_summary_data
• Refactor duplicate code into show_percentile_data function
• Sort department list
• Sort lists for default table order
• Adjust text from 'College' to 'College/Division'
• Load all data up front into dict
• Adjust bokeh plot colors
• Add about_page() and default to show about at start
• Add sponsorship information on each data view page
• Hide MainMenu button
• Add sponsorship details on the about page