Add dark theme support to documentation (#47) #161

Job	Run time
Test pgmq-sqlalchemy (Python 3.9, Driver pg8000)	4m 31s
Test pgmq-sqlalchemy (Python 3.11, Driver pg8000)	4m 39s
Test pgmq-sqlalchemy (Python 3.10, Driver psycopg)	3m 42s
Test pgmq-sqlalchemy (Python 3.12, Driver psycopg)	3m 43s
Test pgmq-sqlalchemy (Python 3.11, Driver asyncpg)	2m 21s
Test pgmq-sqlalchemy (Python 3.9, Driver asyncpg)	2m 26s
Test pgmq-sqlalchemy (Python 3.9, Driver psycopg2)	3m 39s
Test pgmq-sqlalchemy (Python 3.11, Driver psycopg2)	3m 36s
Test pgmq-sqlalchemy (Python 3.10, Driver asyncpg)	2m 25s
Test pgmq-sqlalchemy (Python 3.12, Driver asyncpg)	2m 23s
Test pgmq-sqlalchemy (Python 3.10, Driver pg8000)	4m 38s
Test pgmq-sqlalchemy (Python 3.11, Driver psycopg2cffi)	3m 44s
Test pgmq-sqlalchemy (Python 3.9, Driver psycopg)	3m 40s
Test pgmq-sqlalchemy (Python 3.12, Driver psycopg2cffi)	3m 44s
Test pgmq-sqlalchemy (Python 3.12, Driver pg8000)	4m 50s
Test pgmq-sqlalchemy (Python 3.10, Driver psycopg2cffi)	3m 41s
Test pgmq-sqlalchemy (Python 3.11, Driver psycopg)	3m 47s
Test pgmq-sqlalchemy (Python 3.12, Driver psycopg2)	3m 36s
Test pgmq-sqlalchemy (Python 3.10, Driver psycopg2)	3m 37s
Test pgmq-sqlalchemy (Python 3.9, Driver psycopg2cffi)	3m 43s
Upload coverage to Codecov	12s
	1h 12m 37s

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