Mobile responsive updates to chat user flow

[renanr0cha]

closes #7

This improves the mobile and desktop layout of the queue, chat room and feedback pages while also improving on other related components like:

• adding styles for a mobile version of the header
• fix the lack of a max-h on the char scroll area by adding different max-h to mobile and desktop

For the desktop, I added some changes to the sizes of the video containers to ensure they don't break the container, as has been happening in my observations, especially in 1080p resolutions.

I used the Polypane browser, and everything looks good, from iPhone SE to high-end Androids and iPhones.

Queue:

Chat room:

Feedback:

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[brunocroh]

Awesome work man, I really appreciate your contribution.