Add "Task" build and development process with Taskfile integration

- Added Taskfile.yml to streamline build, development, and testing tasks.
- Updated README to reflect new build instructions and development environment setup using `go-task`.
- Included `.taskfile.env` and `.task` in .dockerignore and .gitignore for better environment management.
- Modified asset loading in verifier.ts to include integrity and cross-origin attributes for security.
- Updated SRI generation script to handle both directory and single file inputs for improved flexibility.

.gitignore

@@ -31,3 +31,5 @@ test_handlers_hashes.json
 .DS_Store
 Thumbs.db
 
+.taskfile.env
+.task