Modifications added to streamline demo.

[glecaros]

This pull request introduces several changes across the backend and frontend of the application. The most significant changes include improvements to the ProcessRequest method in SemanticKernelApp.cs, updates to the frontend's ChatWindow.tsx, and changes to the project's dependencies and configuration.

Backend improvements:

• Backend/Services/SemanticKernelApp.cs: The ProcessRequest method has been updated to improve the handling of chat history. A cacheKey variable has been introduced to store the session ID, which is used to retrieve and update the chat history from the cache. The updated chat history is now stored back in the cache after each bot response. [1] [2]

Frontend improvements:

• Frontend/src/ChatWindow.tsx: The ChatWindow function has been modified to improve the handling of chat messages. The user's message is now added to the messages state only after the bot's response has been received. The updateMessages function has been introduced to update the bot's response message with the content of each response delta and update the messages state. [1] [2]

Project configuration and dependencies:

• Frontend/vite.config.ts: The server configuration has been updated to use HTTPS with the key and certificate read from the certs directory.
• Frontend/.gitignore: The certs directory has been added to the .gitignore file.
• Frontend/package.json and Frontend/package-lock.json: The @types/node package has been added to the project's devDependencies. [1] [2] [3] [4]

Minor changes:

• Frontend/index.html: The favicon and title of the webpage have been updated.
• Frontend/src/index.css: The --background-color CSS variable has been removed.