NCAR/GeoCAT-examples: Pre GeoCAT-viz Release v2022.5.0

This release is to tag a version of this repository before major GeoCAT-viz changes are integrated. What's Changed Fix link issue by @michaelavs in https://github.com/NCAR/GeoCAT-examples/pull/417 Bumped oldest python version from 3.6 to 3.7 by @hCraker in https://github.com/NCAR/GeoCAT-examples/pull/419 Fix RTD memory issue by using mamba by @anissa111 in https://github.com/NCAR/GeoCAT-examples/pull/420 Adding calendar_average example by @hCraker in https://github.com/NCAR/GeoCAT-examples/pull/421 Update NCL_skewt_2_2 to have subtitle by @hCraker in https://github.com/NCAR/GeoCAT-examples/pull/424 Adding climatology_average example by @hCraker in https://github.com/NCAR/GeoCAT-examples/pull/422 New Jupyter Notebooks Section: MPAS Plot with Datashader and Geoviews by @erogluorhan in https://github.com/NCAR/GeoCAT-examples/pull/425 Use mamba for CI by @anissa111 in https://github.com/NCAR/GeoCAT-examples/pull/427 Bump actions/setup-python from 2 to 3 by @dependabot in https://github.com/NCAR/GeoCAT-examples/pull/428 remove push from ci triggers by @anissa111 in https://github.com/NCAR/GeoCAT-examples/pull/430 Pin geocat-viz version by @anissa111 in https://github.com/NCAR/GeoCAT-examples/pull/432 Updating installation instructions by @hCraker in https://github.com/NCAR/GeoCAT-examples/pull/431 Full Changelog: https://github.com/NCAR/GeoCAT-examples/compare/v2021.10.0...v2022.5.