fix(readme): remove information about default password #6152

Job	Run time
Build	10m 15s
Lint Dockerfile	6s
Test (frontend)	55s
Type-check (frontend)	1m 18s
Test (alert-cli)	45s
Lint (frontend)	34s
Type-check (alert-cli)	37s
Test (ingester)	53s
Lint (alert-cli)	36s
Test (export-elasticsearch)	50s
Type-check (ingester)	39s
Test (@socialgouv/cdtn-elasticsearch)	34s
Type-check (export-elasticsearch)	40s
Lint (ingester)	37s
Type-check (@socialgouv/cdtn-types)	38s
Test (@shared/utils)	41s
Lint (export-elasticsearch)	49s
Type-check (@shared/utils)	34s
Lint (@socialgouv/cdtn-elasticsearch)	36s
	22m 37s

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