Update color theme to match with new design (#1821)

Update color theme to match with new design (#1821)

* update silver theme

* update unread badge style to look more slim

* update nav item style to look less sharp

* fix type focus message input typo

* decrease navigation drawer width to bring main chat layout to little more center

* increase sidebar width to make it less congested

* fix sidebar item style

* decrease dark theme contrast

* improve dark theme

* revert sidebar width change

* add join with address option in home context menu

* match legacy theme with latest themes