move example relay implementations to examples/ folder.

examples/rss-bridge/.env

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+DOMAIN=dev2.hazlitt.fiatjaf.com
+SECRET=ie32uyg48o72iv
+HOST=0.0.0.0
+PORT=3002

examples/rss-bridge/db/CURRENT

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+MANIFEST-000164

examples/rss-bridge/db/OPTIONS-000165

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+[Version]
+  pebble_version=0.1
+
+[Options]
+  bytes_per_sync=524288
+  cache_size=8388608
+  cleaner=delete
+  compaction_debt_concurrency=1073741824
+  comparer=leveldb.BytewiseComparator
+  delete_range_flush_delay=0s
+  disable_wal=false
+  flush_split_bytes=4194304
+  format_major_version=1
+  l0_compaction_concurrency=10
+  l0_compaction_threshold=4
+  l0_stop_writes_threshold=12
+  lbase_max_bytes=67108864
+  max_concurrent_compactions=1
+  max_manifest_file_size=134217728
+  max_open_files=1000
+  mem_table_size=4194304
+  mem_table_stop_writes_threshold=2
+  min_compaction_rate=4194304
+  min_deletion_rate=0
+  min_flush_rate=1048576
+  merger=pebble.concatenate
+  read_compaction_rate=16000
+  read_sampling_multiplier=16
+  strict_wal_tail=true
+  table_cache_shards=4
+  table_property_collectors=[]
+  validate_on_ingest=false
+  wal_dir=
+  wal_bytes_per_sync=0
+
+[Level "0"]
+  block_restart_interval=16
+  block_size=4096
+  compression=Snappy
+  filter_policy=none
+  filter_type=table
+  index_block_size=4096
+  target_file_size=2097152