Add /log page that displays server log

This will eventually be behind an authorization guard so that only I
have access, but it's useful to have for monitoring and testing out
turbo streams.

README.md

@@ -34,6 +34,7 @@ PORT=3000
 DATABASE_URL=postgresql://crawlnicle:<password>@localhost/crawlnicle
 DATABASE_MAX_CONNECTIONS=5
 TITLE=crawlnicle
+MAX_MEM_LOG_SIZE=1000000
 ```
 
 4. Install