Simplify README #2216

Job	Run time
Build and test docker images	6m 12s
Lint and Unit test	5m 24s
Build aarch64-apple-darwin	8m 14s
Build debian-x86_64	8m 36s
Build x86_64-apple-darwin	2m 20s
Build x86_64-pc-windows-msvc	5m 19s
Build x86_64-unknown-linux-gnu	1m 51s
Test postgis:11-3.0-alpine sslmode=disable	5m 24s
Test postgis:14-3.3-alpine sslmode=disable	3m 18s
Test on macOS-latest	4m 47s
Test on windows-latest	1m 21s
Test postgis:15-3.3 sslmode=require	5m 19s
Test on ubuntu-latest	49s
Package	47s
CI Finished	2s
	59m 43s

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