Include HTML template in package

The report.html gitignore rule was too broad, excluding
src/context_profiler/templates/report.html from the repo.
This caused --html to fail with FileNotFoundError after install.

Made-with: Cursor

Author: yanpgwang

.gitignore

@@ -31,7 +31,7 @@ Thumbs.db
 htmlcov/
 
 # Generated reports (large files)
-report.html
+/report.html
 *.lhar
 
 # Trace files