reorder lectures

Author: mmcky

lectures/_toc.yml

@@ -1,23 +1,20 @@
 format: jb-book
 root: intro
 parts:
-- caption: Intro to Computational Economics
+- caption: Introduction
   numbered: true
   chapters:
   - file: intro_economics
+  - file: inequality
 - caption: Tools & Techniques
   numbered: true
   chapters:
   - file: geom_series
   - file: short_path
   - file: scalar_dynam
-  - file: markov_chains
   - file: linear_equations
   - file: lln_clt
-- caption: Introductory Economics
-  numbered: true
-  chapters:
-  - file: inequality
+  - file: markov_chains
 - caption: Models
   numbered: true
   chapters: