TODOs

Blocking tasks are now capital TODO (compared to non-blocking todo).
Updated some of the todos.
Added note about which intel synth does which families.
Rename extended Yosys universe to Yosys family.
Added brief text to landing page, and also a note about the restructure and where to find old docs.
Moved todolist above ToC in preparation for disabling it in the config (so that it doesn't need it's own header).

Fixed pdf build, was previously breaking on trying to include the svg badges.

docs/source/using_yosys/more_scripting/index.rst

@@ -1,6 +1,8 @@
 More scripting
 --------------
 
+.. todo:: brief overview for the more scripting index
+
 .. toctree::
    :maxdepth: 3
 

docs/source/using_yosys/more_scripting/interactive_investigation.rst

@@ -260,7 +260,7 @@ switch back). Now the `ls` command lists the objects within that module.
 :numref:`lscd` below demonstrates this using the ``example.v`` from
 `A simple circuit`_
 
-.. todo:: update yosys output with $ternary$example.v$3
+.. TODO:: update yosys output with $ternary$example.v$3
 
 .. code-block:: none
    :caption: Demonstration of :cmd:ref:`ls` and :cmd:ref:`cd` having run ``yosys example.v``

docs/source/using_yosys/more_scripting/selections.rst

@@ -263,7 +263,7 @@ diagram in :numref:`memdemo_00`.
    
    Complete circuit diagram for the design shown in :numref:`memdemo_src`
 
-.. todo:: :ref:`memdemo_01` and :ref:`memdemo_02` are the same, probably change
+.. TODO:: :ref:`memdemo_01` and :ref:`memdemo_02` are the same, probably change
           the example so they aren't.
 
 There's a lot going on there, but maybe we are only interested in the tree of