[FIX] Sidebar and RTL alignments

[karlprieb]

@RocketChat/core

Closes #8148 #8129 #8165 #8179 #8184 #8185 #8182

Sidebar:

• Removed empty space above sidebar header
• Fixed header color on lighten version of the sidebar
• Fixed empty room groups alignment
• Fixed livechat icon alignment
• Fixed Back button alignment

Create Channel:

• Fixed create channel page on mobile
• Now private channels are default

Popover:

• Fixed popover position on RTL

[rodrigok]

[rodrigok]

The popover when click on + icon is going out of the screen

[rodrigok]

When creating a new room, the initial label of the room type switch is wrong

[rodrigok]

On create room screen and using RTL the switch layout is broken and the label is very near to the switch

[cyclops24]

@rodrigok, @karlprieb Please visit #8175

[karlprieb]

@rodrigok thank for you report :)
It's fixed!

[faziloub]

@karlprieb did you fixed the height of sidenav in admin ?? and profile height for mobile?? becaus its has even issue on scroll

[cyclops24]

@karlprieb #8182 not fixed with this PR.