docs(CONTRIBUTING): simplify contribution steps and remove redundant test process

- Updated `README.md` and `CONTRIBUTING.md` to streamline contribution instructions.
- Removed references to running tests (`npm test`) as part of the contribution process to reduce complexity for contributors.
- Adjusted steps to focus on creating feature branches, using conventional commit messages, and submitting pull requests.
- Simplified `package.json` by removing unused devDependencies (`jest`, `@types/jest`, `ts-jest`) to reflect the updated process.

package.json

@@ -85,17 +85,14 @@
     "@rollup/plugin-node-resolve": "^15.2.3",
     "@rollup/plugin-replace": "^5.0.5",
     "@rollup/plugin-typescript": "^11.1.6",
-    "@types/jest": "^29.5.3",
     "@types/node": "^20.4.5",
     "@types/omelette": "^0.4.5",
     "@types/uuid": "^10.0.0",
     "@typescript-eslint/eslint-plugin": "^6.0.0",
     "@typescript-eslint/parser": "^6.0.0",
     "eslint": "^8.45.0",
-    "jest": "^29.6.2",
     "rollup": "^4.12.0",
     "rollup-plugin-terser": "^7.0.2",
-    "ts-jest": "^29.1.1",
     "tslib": "^2.8.1",
     "typescript": "^5.1.6"
   },