seeds: Pull nodes from virtu's crawler

Pull additional nodes from virtu's crawler. Data includes sufficient
Onion and I2P nodes to align the uptime requirements for these networks
to that of clearnet nodes (i.e., 50%). Data also includes more than
three times the number of CJDNS nodes currently hardcoded into
nodes_main_manual.txt, so hardcoded nodes becomes obsolete.

contrib/seeds/README.md

@@ -8,16 +8,17 @@ and remove old versions as necessary (at a minimum when SeedsServiceFlags()
 changes its default return value, as those are the services which seeds are added
 to addrman with).
 
-The seeds compiled into the release are created from sipa's and achow101's DNS seed and AS map
-data. Run the following commands from the `/contrib/seeds` directory:
+The seeds compiled into the release are created from sipa's and achow101's DNS seed,
+virtu's crawler, and fjahr's community AS map data. Run the following commands from the
+`/contrib/seeds` directory:
 
 ```
 curl https://bitcoin.sipa.be/seeds.txt.gz | gzip -dc > seeds_main.txt
 curl https://mainnet.achownodes.xyz/seeds.txt.gz | gzip -dc >> seeds_main.txt
 curl https://testnet.achownodes.xyz/seeds.txt.gz | gzip -dc > seeds_test.txt
+curl https://21.ninja/seeds.txt.gz | gzip -dc >> seeds_main.txt
 curl https://raw.githubusercontent.com/fjahr/asmap-data/main/latest_asmap.dat > asmap-filled.dat
 python3 makeseeds.py -a asmap-filled.dat -s seeds_main.txt > nodes_main.txt
-cat nodes_main_manual.txt >> nodes_main.txt
 python3 makeseeds.py -a asmap-filled.dat -s seeds_test.txt > nodes_test.txt
 # TODO: Uncomment when a seeder publishes seeds.txt.gz for testnet4
 # python3 makeseeds.py -a asmap-filled.dat -s seeds_testnet4.txt -m 30000 > nodes_testnet4.txt