Rework lesson on defining functions

pyvec#633

Author: encukou

courses/pyladies/info.yml

@@ -55,11 +55,9 @@ plan:
     url: https://pyvec.github.io/cheatsheets/basic-git/basic-git-cs.pdf
     type: cheatsheet
 
-- title: Funkce & Řetězce
+- title: Řetězce
   slug: def-str
   materials:
-  - lesson: beginners/def
-  - lesson: beginners/nested-traceback
   - lesson: beginners/str
   - lesson: beginners/str-index-slice
   - lesson: beginners/str-methods
@@ -68,6 +66,13 @@ plan:
     url: https://pyvec.github.io/cheatsheets/strings/strings-cs.pdf
     type: cheatsheet
 
+- title: Definice funkcí
+  slug: def
+  materials:
+  - lesson: beginners/def
+  - lesson: beginners/nested-traceback
+  - lesson: beginners/local-variables
+
 - title: Testování
   slug: tests
   materials: