move geom_series back to Foundations

Author: mmcky

lectures/_toc.yml

@@ -18,6 +18,7 @@ parts:
  - file: intro_supply_demand
  - file: linear_equations
  - file: complex_and_trig
+ - file: geom_series
 - caption: "Linear Dynamics: Finite Horizons"
  numbered: true
  chapters:
@@ -29,7 +30,6 @@ parts:
 - caption: "Linear Dynamics: Infinite Horizons"
  numbered: true
  chapters:
- - file: geom_series
  - file: eigen_I
 - caption: Probability and Distributions
  numbered: true