Update config.yaml to have new lessons

Author: connoraird

config.yaml

@@ -34,7 +34,7 @@ life_cycle: 'pre-alpha'
 license: 'CC-BY 4.0'
 
 # Link to the source repository for this lesson
-source: 'https://github.com/UCL-ARC/fortran-unit-testing-lesson/'
+source: 'https://github.com/UCL-ARC/fortran-unit-testing-lesson'
 
 # Default branch of your lesson
 branch: 'main'
@@ -66,8 +66,8 @@ contact: 'c.aird@ucl.ac.uk'
 
 # Order of episodes in your lesson
 episodes: 
-- 1-intro-to-unit-tests.md
-- 2-intro-to-fortran-unit-tests.md
+- 1-what-is-a-unit-tests.md
+- 2-refactor-fortran.md
 - 3-fortran-unit-test-syntax.md
 - 4-debugging-a-broken-test.md
 - 5-testing-parallel-code.md