* feat(ui): add NewGuildsList()
* fix(ui): remove redundant \n from guilds list
* feat(ui): add guilds List to main Flex
* refactor(ui): rename TreeView to channels TreeView
* feat: separate guilds from TreeView
* ui/flex: increase proportionate size of TreeView
* main: sort guild channels according to channel positions
* docs: update README preview
* main: add keybinding for guilds List