fix: Remove more duplicate width specifications that were causing warnings in slides/github-workflow/index.qmd.

Author: gkapfham

slides/github-workflow/index.qmd

@@ -102,7 +102,7 @@ students and instructors
 
 :::: {.columns}
 
-::: {.column width="50%" style="font-size: 0.8em;"}
+::: {.column style="font-size: 0.8em;"}
 
 ### {{< iconify material-symbols:check-rounded >}} **Setup Repositories**  
 - Write full solution with tests  
@@ -111,7 +111,7 @@ students and instructors
 
 :::
 
-::: {.column width="50%" style="font-size: 0.8em;"}
+::: {.column style="font-size: 0.8em;"}
 
 ### {{< iconify material-symbols:check-rounded >}} **Setup GitHub Classroom**