docs: improves readme (#2367) #3

Job	Run time
lint / bundle / checkbundle (3.10)	49s
lint / prettier / checkprettier (3.10)	37s
lint / black (3.9) / checkblack (3.9)	30s
lint / black (3.10) / checkblack (3.10)	33s
lint / mypy (3.10) / mypy (3.10)	40s
lint / mypy (3.9) / mypy (3.9)	36s
lint / ruff (3.10) / checkruff (3.10)	31s
lint / ruff (3.9) / checkruff (3.9)	30s
lint / pyright (3.10) / pyright (3.10)	44s
lint / pyright (3.9) / pyright (3.9)	37s
openapi / openapi (3.10)	39s
regtest (3.9, CoreLightningWallet) / regtest	2m 15s
regtest (3.9, CoreLightningRestWallet) / regtest	2m 8s
jmeter (3.9, 1.5.1) / jmeter	8m 27s
migrations (3.9) / tests	1m 15s
regtest (3.9, EclairWallet) / regtest	2m 24s
regtest (3.9, LNbitsWallet) / regtest	3m 14s
regtest (3.9, LndRestWallet) / regtest	2m 17s
regtest (3.9, LndWallet) / regtest	2m 19s
tests (3.10) / tests	1m 4s
tests (3.10, postgres://lnbits:lnbits@0.0.0.0:5432/lnbits) / tests	1m 7s
tests (3.9) / tests	57s
tests (3.9, postgres://lnbits:lnbits@0.0.0.0:5432/lnbits) / tests	54s
	35m 7s

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