use service_threads instead of hardcoding 8

scrape.py

@@ -94,7 +94,7 @@ cursor = db.cursor()
 print("Downloading posts")
 cursor.execute("SELECT `handle`, `outbox` FROM `fedi_accounts` ORDER BY RAND()")
 accounts = cursor.fetchall()
-with Pool(8) as p:
+with Pool(cfg['service_threads']) as p:
 	p.map(scrape_posts, accounts)
 
 print("Done!")

service.py

@@ -23,7 +23,7 @@ print("Generating posts")
 cursor.execute("SELECT handle FROM bots WHERE enabled = TRUE AND TIMESTAMPDIFF(MINUTE, last_post, CURRENT_TIMESTAMP()) > post_frequency")
 bots = cursor.fetchall()
 
-with Pool(8) as p:
+with Pool(cfg['service_threads']) as p:
 	p.map(functions.make_post, bots)
 
 #TODO: other cron tasks should be done here, like updating profile pictures