Update sphinx_rtd_theme pin to 0.5.2 and fix PrawnBlaster nested listing.

Author: dihm

docs/source/devices/prawnblaster.rst

@@ -10,19 +10,19 @@ The PrawnBlaster takes advantage of the specs of the Pico to provide the followi
 
 * Configurable as 1, 2, 3, or 4 trulty independent pseudoclocks. 
 
-   - Each clock has its own independent instruction set and synchronization between clocks is not required.
-   - Assuming the default internal clock of 100 MHz, each clock has:
+  - Each clock has its own independent instruction set and synchronization between clocks is not required.
+  - Assuming the default internal clock of 100 MHz, each clock has:
 
-      - Minimum pulse half-period of 50 ns
-      - Maximum pulse half-period of 42.9 s
-      - Half-period resolution of 10 ns
+     - Minimum pulse half-period of 50 ns
+     - Maximum pulse half-period of 42.9 s
+     - Half-period resolution of 10 ns
 
 * 30,000 instructions (each with up to 2^32 repetitions) distributed evenly among the configured pseudoclocks; 30,000, 15,000, 10,000, and 7,500 for 1, 2, 3, 4 pseudoclocks respectively.
 * Support for external hardware triggers (external trigger common to all pseudoclocks)
 
-   - Up to 100 retriggers (labscript-suite waits) per pseudoclock
-   - Each wait can support a timeout of up to 42.9 s
-   - Each wait is internally monitored for its duration (resolution of +/-10 ns)
+  - Up to 100 retriggers (labscript-suite waits) per pseudoclock
+  - Each wait can support a timeout of up to 42.9 s
+  - Each wait is internally monitored for its duration (resolution of +/-10 ns)
 
 * Can be referenced to an external LVCMOS clock
 * Internal clock can be set up to 133 MHz (timing specs scale accordingly)

setup.cfg

@@ -45,6 +45,6 @@ install_requires =
 docs = 
   PyQt5
   Sphinx==3.2.1
-  sphinx-rtd-theme==0.4.3
+  sphinx-rtd-theme==0.5.2
   recommonmark==0.6.0
   m2r==0.2.1