Cherry-pick from #137 (#142)

* Update config.default.yaml

Some people find it counterintuitive that battery and H2 storage are not kept from PyPSA-Eur. An explicit mention can help here.

* Update installation.rst

We only use one config.yaml file

* Add an arrow from biomass to carbon dioxide.

This signals that we also have BECCS in the model.

Co-authored-by: martavp <martavictoriaperez@gmail.com>

config.default.yaml

@@ -71,7 +71,8 @@ electricity:
 
 # regulate what components with which carriers are kept from PyPSA-Eur;
 # some technologies are removed because they are implemented differently
-# or have different year-dependent costs in PyPSA-Eur-Sec
+# (e.g. battery or H2 storage) or have different year-dependent costs 
+# in PyPSA-Eur-Sec
 pypsa_eur:
   Bus:
     - AC

doc/installation.rst

@@ -89,10 +89,8 @@ The data licences and sources are given in the following table.
 Set up the default configuration
 ================================
 
-First make your own copy of the ``config.yaml``. For overnight
-scenarios, use ``config.default.yaml``. For a pathway optimization
-with myopic foresight (which is still experimental), use
-``config.myopic.yaml``. For example:
+First make your own copy of the ``config.yaml`` based on 
+ ``config.default.yaml``. For example:
 
 .. code:: bash