feat: add a minimalist theme

[clins1994]

⚠️ Heads Up

Since this is the first PR for this repo and I'm not sure if there's a plan to hold custom 'experimental' themes inside it I've decided to proactively move my work on this theme to a public repository in my personal account: https://github.com/clins777/texts-minimalist-theme

I'll leave this PR open until I get a reply and then go from there 🫰🏼

Overview

A minimalist theme that attempts to strip down the chatting experience to the very basics

Tested mainly on dark theme with bubble mode off

Screenshot

Side bar

• hide all, unread, archive tabs
• hide time stamps in each message
• resize each user height to 40px (only tested with hidden previews)
• fixed side bar width to 180px, resizing sometimes wasn't working
• hide scroll bar

Chat

• align sender's content to the right
• hide dates in chat wherever they appear
• hide various input commands near where you type message
• hide 'seen by' avatars
• hide the avatar + contact's name title on the top
• hide placeholder text in the message input by making it transparent
• hide non is-diff-sender gaps
• hide unread divider
• message flex direction is row instead of column so that reactions are on the left
• reactions are centered vertically to the right
• hide message reply sender names
• hide scroll bar

Others

• completely omitted reels or related content (https://github.com/clins777/desktop-css/blob/31c0d0b6d00f05b21d2483ff9d08e7300f4c1f50/default/experiments/minimalist.css#L46-L47)
• aligned your own messages to the right
• made primary color green

Any other more minimalist ideas for this theme are more than welcome 🤗

README

• added 'experiments' section to readme
• added short 'minimalist' theme description to experiments section