docs: adapt to Palladium, drop Bitcoin/upstream examples and links

index, features, HOWTO (node requirements, sizes and sync time measured on
Palladium, real startup log, clone URL), environment, peer discovery and
architecture; rpc-interface examples (getinfo, peers, query with real data);
release_process rewritten without tags/PyPI; changelog gets a plm-electrumx
1.0.0 entry above the upstream history. Links point to this repository.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

docs/features.rst

@@ -2,11 +2,8 @@ Features
 ========
 
 - Efficient, lightweight reimplementation of electrum-server
-- Fast synchronization of bitcoin mainnet from Genesis.  Recent
-  hardware should synchronize in well under 24 hours.  The fastest
-  time to height 448k (mid January 2017) reported is under 4h 30m.  On
-  the same hardware JElectrum would take around 4 days and
-  electrum-server probably around 1 month.
+- Fast synchronization of Palladium mainnet from Genesis: about a
+  minute to height 542k on a modern development machine with RocksDB.
 - Various configurable means of controlling resource consumption and
   handling bad clients and denial of service attacks.  These include
   maximum connection counts, subscription limits per-connection and