* Updates start silent, turning on startWithAudioMuted and few UI tweaks.

Disabled mic unmute button and removes remote participants volume slider.

* Adds analytics for start silent.

* Removes extra semi colon.

* Updates lib-jitsi-meet and updates meeting info text.

This reverts commit 890151fa72.

For remote chat messages, all corners should be rounded
except the top left. For local messages all corners
should be rounded except the top right.

By making the container 100% height and position relative, that
would cause it to overlap any static-positioned  elements below it.
The 100% makes it so that any watermarks intended for the bottom
of the page show up on the bottom of the page. However, it's not
needed because watermark stylings already try to position the
watermarks at the bottom.

Otherwise it can eat clicks on elements it is above,
like YouTube and Etherpad controls.

The chat icons are different on windows and mac, with
windows icons being bigger. By settings a specific
width on the smiley container, windows would see
part of the smiley cut off.

* Removes unused ADD_PEOPLE_APP_NAME
* Moves deep-link header background and logo size as variables.
* Fixes more numbers page space in the header.
* Fixes left padding on deep-linking mobile page.