Revamp the config system for Top/Harness (#347)

* Refactor how Configs parameterize the Top and TestHarnesses

* Bump sha3, testchipip, icenet, firesim

docs/Customization/index.rst

@@ -3,18 +3,41 @@ Customization
 
 These guides will walk you through customization of your system-on-chip:
 
-- Contructing heterogenous systems-on-chip using the Chipyard generators and configuration system.
+- Contructing heterogenous systems-on-chip using the existing Chipyard generators and configuration system.
 
-- Adding custom accelerators to your system-on-chip.
+- How to include your custom Chisel sources in the Chipyard build system
 
-Hit next to get started!
+- Adding custom RoCC accelerators to an existing Chipyard core (BOOM or Rocket)
+
+- Adding custom MMIO widgets to the Chipyard memory system by Tilelink or AXI4, with custom Top-level IOs
+
+- Standard practices for using Keys, Traits, and Configs to parameterize your design
+
+- Customizing the memory hierarchy
+
+- Connect widgets which act as TileLink masters
+
+- Adding custom blackboxed verilog to a Chipyard design
+
+We also provide information on:
+
+- The boot process for Chipyard SoCs
+
+- Examples of FIRRTL transforms used in Chipyard, and where they are specified
+
+We recommend reading all these pages in order. Hit next to get started!
 
 .. toctree::
    :maxdepth: 2
    :caption: Customization:
 
    Heterogeneous-SoCs
-   Adding-An-Accelerator
+   Custom-Chisel
+   RoCC-or-MMIO
+   RoCC-Accelerators
+   MMIO-Peripherals
+   Keys-Traits-Configs
+   DMA-Devices
    Incorporating-Verilog-Blocks
    Memory-Hierarchy
    Boot-Process