[UPDATE] Adding placeholder for google Analytics (#67)

* added plugins config

* renaming folder and path

* Added GA code for programming lectures #67

* Add new html metadata variables

Co-authored-by: DrDrij <dr.drij@gmail.com>

Author: AakashGfude

lectures/_config.yml

@@ -25,4 +25,5 @@ sphinx:
       twitter_logo_url: https://assets.quantecon.org/img/qe-twitter-logo.png
       og_logo_url: https://assets.quantecon.org/img/qe-og-logo.png
       description: This website presents a set of lectures on python programming for economics, designed and written by Thomas J. Sargent and John Stachurski.
-      keywords: Python, QuantEcon, Quantitative Economics, Economics, Sloan, Alfred P. Sloan Foundation, Tom J. Sargent, John Stachurski
+      keywords: Python, QuantEcon, Quantitative Economics, Economics, Sloan, Alfred P. Sloan Foundation, Tom J. Sargent, John Stachurski
+      google_analytics_id: UA-54984338-9