cleanup: migrate bootstrap5, remove unused css, fix indent, reuse bs classes (#1048)

* migrate: bootstrap5, remove unused css, fix indent, reuse bs classes

* DOC: changes.md

Author: pratapvardhan

CHANGES.md

@@ -11,6 +11,10 @@
 
 * update `/healthz` endpoint to return dependencies versions (titiler, rasterio, gdal, ...) (author @scottyhq, https://github.com/developmentseed/titiler/pull/1056)
 
+### titiler.application
+
+* migrate `templates/index.html` to bootstrap5, remove unused css, reuse bs classes (author @PratapVardhan, https://github.com/developmentseed/titiler/pull/1048)
+
 ## 0.19.2 (2024-11-28)
 
 ### Misc