Update 2 files

• /.gitlab-ci.yml
• /book/intro.md

book/_toc.yml

@@ -177,7 +177,7 @@ parts:
       - file: time_series/acf
         title: "Autocovariance function (ACF)"
       - file: time_series/ar.ipynb
-        title: "AutoRegressive Moving Average (AR) process"
+        title: "AutoRegressive (AR) process"
         sections:
         - file: time_series/ar_exercise.ipynb
       - file: time_series/forecasting
@@ -395,19 +395,8 @@ parts:
     - file: programming/week_1_8
       sections:
       - file: external/learn-python/book/08/sympy
-    # THIS IS FOR WEEK 2.4
-    # START REMOVE-FROM-PUBLISH
-    - file: programming/gurobi
-      title: Gurobi
-      sections:
-      - file: programming/gurobi/install
-        title: Installation
-    # END REMOVE-FROM-PUBLISH
-    # THIS IS FOR WEEK 2.5
-    # START REMOVE-FROM-PUBLISH
-      - file: programming/gurobi/usage
-        title: Usage
-    # END REMOVE-FROM-PUBLISH
+    - file: optimization/gurobi.md
+      title: "Week 2.4: Gurobi installation"
 
   - caption: Fundamental Concepts
     numbered: 2