Route average speed charts

[tiffanychu90]

gtfs_digest

• Add gtfs_digest/merge_data.py script to merge schedule with speeds data and save it out
• Stand up a portfolio plotting only average route speeds over time with parameterized notebook
  • Replace route_speeds in portfolio with this, instead of the Apr/Oct stop pair charts
• Use this to figure out why some average speeds are jumping around...maybe it's hovering around 8 mph and then in Jan it jumps to 20 mph.
  • We might need a filtering step when we get trip-level speeds, we only count ones with sufficient meters_elapsed and sec_elapsed to go into route averages?
• Adapt Makefile commands - most of the portfolio commands are similar. Rewrite and inject the site name as variable and string together building / deploying of portfolio with $(eval override site = route_speeds) $(eval export site = route_speeds)
• Epic - GTFS Digest (exploratory portfolio) #989

[github-actions]

nbviewer URLs for impacted notebooks:

• gtfs_digest/report.ipynb
• rt_segment_speeds/28_route_averages.ipynb

[github-actions]

nbviewer URLs for impacted notebooks:

• gtfs_digest/report.ipynb
• rt_segment_speeds/28_route_averages.ipynb

[github-actions]

nbviewer URLs for impacted notebooks:

• gtfs_digest/report.ipynb
• rt_segment_speeds/28_route_averages.ipynb