Reorganising documentation

Also changing to furo theme.

docs/source/getting_started/scripting_intro.rst

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+Scripting in Yosys
+------------------
+
+.. TODO: copypaste
+
+Yosys reads and processes commands from synthesis scripts, command line
+arguments and an interactive command prompt. Yosys commands consist of a command
+name and an optional whitespace separated list of arguments. Commands are
+terminated using the newline character or a semicolon (;). Empty lines and lines
+starting with the hash sign (#) are ignored. See :ref:`sec:typusecase` for an
+example synthesis script.
+
+The command ``help`` can be used to access the command reference manual.
+
+Most commands can operate not only on the entire design but also specifically on
+selected parts of the design. For example the command dump will print all
+selected objects in the current design while dump foobar will only print the
+module foobar and dump \* will print the entire design regardless of the current
+selection.
+
+.. code:: yoscrypt
+
+	dump */t:$add %x:+[A] \*/w:\* %i
+
+The selection mechanism is very powerful. For example the command above will
+print all wires that are connected to the ``\A`` port of a ``$add`` cell.
+Detailed documentation of the select framework can be found in the command
+reference for the ``select`` command.