Further root readme bump, factor `.clearing` content

In line with our move to `uv` and recent `nix` support update a bunch of
the summary content and factor out the order-control section to a new
`.piker.clearing` readme file with embedded todos therein.

README.rst

@@ -43,24 +43,22 @@ focus and feats:
 fitting with these tenets, we're always open to new
 framework/lib/service interop suggestions and ideas!
 
-- **100% federated**:
+- **100% federated**
   your code, your hardware, your data feeds, your broker fills.
 
-- **zero web**:
+- **zero web**
   low latency as a prime objective, native UIs and modern IPC
   protocols without trying to re-invent the "OS-as-an-app"..
 
-- **maximal privacy**:
+- **maximal privacy**: prevent brokers and mms from knowing your
-  prevent brokers and mms from knowing your planz; smack their
+                       planz; smack their spreads with dark volume
-  spreads with dark volume from a VPN tunnel.
+                       from a VPN tunnel.
 
-- **zero clutter**:
+- **zero clutter**: modal, context oriented UIs that echew minimalism,
-  modal, context oriented UIs that echew minimalism, reduce thought
+                reduce thought noise and encourage un-emotion.
-  noise and encourage un-emotion.
 
-- **first class parallelism**:
+- **first class parallelism**: built from the ground up on a next-gen
-  built from the ground up on a next-gen structured concurrency
+                           structured concurrency supervision sys.
-  supervision sys.
 
 - **traders first**: broker/exchange/venue/asset-class/money-sys agnostic