サヨナラ E2EE

[voluntas]

This pull request includes significant changes primarily focused on the removal of the E2EE (End-to-End Encryption) functionality and related dependencies from the project. The most important changes include the deletion of E2EE-related files, updates to documentation, and adjustments to package management configurations.

Removal of E2EE Functionality:

• examples/e2ee/index.html: Removed the entire HTML structure for the E2EE test page.
• examples/e2ee/main.mts: Removed the main TypeScript file for the E2EE example, including all related classes and methods.
• packages/e2ee/package.json: Deleted the package configuration file for the E2EE library, along with all dependencies and scripts.
• packages/e2ee/rollup.config.mjs: Removed the Rollup configuration file for building the E2EE library.
• packages/e2ee/src/sora_e2ee.ts: Deleted the source file for the E2EE library, including all related types and classes.

Documentation Updates:

• README.md: Removed the section on End-to-End Encryption (E2EE).
• NOTICE.md: Removed the notice related to the Go Authors and the wasm_exec.js file.

Package Management:

• package.json: Updated the pnpm package manager version from 9.7.1 to 9.9.0.

Miscellaneous:

• examples/index.html: Removed the link to the E2EE sample page.