Update python guide (#90)

* Update psycopg2 and hypertable sections in python guide

* Code formatting

* Reorganize 3rd and 4th secton and minor changes and link fixes

* Update timescaledb/quick-start/python.md

Co-authored-by: Lana Brindley <github@lanabrindley.com>

* Apply minor suggestions from review

Co-authored-by: Lana Brindley <github@lanabrindley.com>
Co-authored-by: Ryan Booz <ryan@timescale.com>

* Minor change in sample code

* Update links

* Add generate_series description

* "performantly" no more

* Use sensor_data table instead of taxi cab for tutorial

Co-authored-by: Lana Brindley <github@lanabrindley.com>
Co-authored-by: Ryan Booz <ryan@timescale.com>

Author: 3 people