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

@@ -62,17 +62,23 @@ framework/lib/service interop suggestions and ideas!
   built from the ground up on a next-gen structured concurrency
   supervision sys.
 
-- **traders first**: broker/exchange/venue/asset-class/money-sys agnostic
+- **traders first**:
+  broker/exchange/venue/asset-class/money-sys agnostic
 
-- **systems grounded**: real-time financial signal processing (fsp) that will
-                    make any queuing or DSP eng juice their shorts.
+- **systems grounded**:
+  real-time financial signal processing (fsp) that will make any
+  queuing or DSP eng juice their shorts.
 
-- **non-tina UX**: sleek, powerful keyboard driven interaction with
-               expected use in tiling wms (or maybe even a DDE).
+- **non-tina UX**:
+  sleek, powerful keyboard driven interaction with expected use in
+  tiling wms (or maybe even a DDE).
 
-- **data collab at scale**: every actor-process and protocol is multi-host aware.
+- **data collab at scale**:
+  every actor-process and protocol is multi-host aware.
 
-- **fight club ready**: zero interest in adoption by suits; no corporate friendly license, ever.
+- **fight club ready**:
+  zero interest in adoption by suits; no corporate friendly license,
+  ever.
 
 building the hottest looking, fastest, most reliable, keyboard
 friendly FOSS trading platform is the dream; join the cause.
@@ -87,15 +93,15 @@ bc why install with `python` when you can faster with `rust` ::
 
 hacky install on nixos
 **********************
-`NixOS` is our core devs' distro of choice for which we offer
+``NixOS`` is our core devs' distro of choice for which we offer
 a stringently defined development shell envoirment that can be loaded with::
 
     nix-shell default.nix
 
 
-run a realtime OHLCV chart stand-alone
-*************************************
-::
+start a chart
+*************
+run a realtime OHLCV chart stand-alone::
 
     piker -l info chart btcusdt.spot.binance xmrusdt.spot.kraken