Reapply "Add groups to command reference"

This reverts commit 81f87ce6ed.

docs/source/using_yosys/more_scripting/interactive_investigation.rst

@@ -323,10 +323,10 @@ tools).
   design into an equivalent design that is easier to analyse.
 - Commands such as `eval` and `sat` can be used to investigate the behavior of
   the circuit.
-- :doc:`/cmd/show`.
-- :doc:`/cmd/dump`.
-- :doc:`/cmd/add` and :doc:`/cmd/delete` can be used to modify and reorganize a
-  design dynamically.
+- :cmd:title:`show`.
+- :cmd:title:`dump`.
+- :cmd:title:`add` and :cmd:title:`delete` can be used to modify and reorganize
+  a design dynamically.
   
 The code used is included in the Yosys code base under
 |code_examples/scrambler|_.
@@ -358,7 +358,7 @@ reorganizing a module in Yosys and checking the resulting circuit.
 .. figure:: /_images/code_examples/scrambler/scrambler_p02.*
     :class: width-helper invert-helper
 
-Analyzing the resulting circuit with :doc:`/cmd/eval`:
+Analyzing the resulting circuit with :cmd:title:`eval`:
 
 .. todo:: replace inline code
 

docs/source/using_yosys/more_scripting/load_design.rst

@@ -86,7 +86,7 @@ Yosys frontends
 The `read_verilog` command
 """"""""""""""""""""""""""
 
-- :doc:`/cmd/read_verilog`
+- :doc:`/cmd/index_frontends`
 - supports most of Verilog-2005
 - limited support for SystemVerilog
 - some non-standard features/extensions for enabling formal verification

docs/source/using_yosys/more_scripting/selections.rst

@@ -93,7 +93,7 @@ Special patterns can be used to select by object property or type. For example:
   A:blabla`
 - select all `$add` cells from the module foo: :yoscrypt:`select foo/t:$add`
 
-A complete list of pattern expressions can be found in :doc:`/cmd/select`.
+A complete list of pattern expressions can be found in :cmd:title:`select`.
 
 Operations on selections
 ~~~~~~~~~~~~~~~~~~~~~~~~
@@ -141,7 +141,7 @@ Some of the special ``%``-codes:
 - ``%i``: intersection of top two elements on stack -- pop 2, push 1
 - ``%n``: inverse of top element on stack -- pop 1, push 1
 
-See :doc:`/cmd/select` for the full list.
+See :cmd:title:`select` for the full list.
 
 Expanding selections
 ^^^^^^^^^^^^^^^^^^^^
@@ -354,7 +354,7 @@ boolean operations such as intersection (``%i``) and difference (``%d``) are
 powerful tools for extracting the relevant portions of the circuit under
 investigation.
 
-Again, see :doc:`/cmd/select` for full documentation of these expressions.
+Again, see :cmd:title:`select` for full documentation of these expressions.
 
 Incremental selection
 ^^^^^^^^^^^^^^^^^^^^^