Update for v0.0.9 release

[ulyssa]

I'm still wrapping up some things for the v0.0.9 release, but I will need to make sure the website is updated for at least the following:

• Links should be "openable" iamb#43
• Add support for previewing images in room scrollback iamb#108
• Support composing messages in an external editor iamb#155
• Add support for logging in with SSO iamb#160
• Is there a way to logout iamb#162
• Support custom sorting for room and user lists iamb#170
• Add desktop file for GUI environment launchers iamb#178
• Add a new :chats window that lists both DMs and Rooms iamb#184
• Update README.md to add openSUSE Tumbleweed iamb#191
• Support coloring entire message with the user color iamb#193
• Add example of mapping "V" to toggle message selection mode iamb#195
• Indicate and sort on rooms with unread messages iamb#205
• Support following the .well-known entries for a username's domain iamb#209
• Add snap install instructions iamb#210
• Add support for threads iamb#216
• Add support for custom key macros iamb#217
• Support displaying shortcodes instead of Emojis in messages iamb#222
• Support configuring user gutter width iamb#223