fix: Server sidebar not scrolling

[preeesha]

Closes #259

Previously the server list in the sidebar was not scrolling when there're many servers (causing overflow condition). Ther is not able to open other options such as Settings and Downloads as well. Here's a before and after:

Before:

https://github.com/RocketChat/Rocket.Chat.Electron/assets/126406840/eaa2da4c-c554-4004-a993-5d13bea37492

After:

https://github.com/RocketChat/Rocket.Chat.Electron/assets/126406840/8b2b8932-0fd4-42ae-bcf0-71b0c24f3913

[preeesha]

Hey @jeanfbrito, I have used grid system in the sidebar for a stable scrolling experience. Kindly have a look. If there're any changes required, I would love to make those too.

Thanks for your time Prisha Gupta

[jeanfbrito]

The tooltip seems broken, please take a look.