Set DNS record for snowflake.torproject.net back to production bridge

#40598 (closed) changed the DNS for snowflake.torproject.net temporarily. This issue is to remember to change it back when the bridge upgrade in tpo/anti-censorship/pluggable-transports/snowflake#40095 (closed) is done.

The production bridge's addresses are

37.218.242.151
2a00:c6c0:0:151:4:8f94:69f5:7c01

We are not ready to switch back yet. I will update the issue when we are ready. It should be by 2022-02-04.

After switching the DNS back, you can restore the usual TTL (#40595 (closed)).

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information