docs: rewrite README for Sanctum — remove build docs, keep install only

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -2,19 +2,21 @@
 
 # Sanctum
 
-**A private, self-hosted desktop client for [mithraic.space](https://mithraic.space)**  
+**The desktop client for [mithraic.space](https://mithraic.space)**  
-Built on [Revolt](https://revolt.chat) — open source, no tracking, no telemetry, no nonsense.  
+Private. Self-hosted. No tracking, no telemetry, no nonsense.  
-Windows & Linux. Auto-updates from your own server.
+Windows & Linux.
 
 </div>
 
 ---
 
-## What is this?
+## What is Sanctum?
 
-Sanctum is a custom fork of [Stoat for Desktop](https://github.com/stoatchat/for-desktop), hardwired to connect exclusively to **mithraic.space** — a self-hosted Revolt instance. It replaces the default branding, icons, and update pipeline with a fully self-contained setup hosted on a private Forgejo instance.
+Sanctum is the official desktop client for **mithraic.space** — a private, self-hosted chat community. It's hardwired to connect exclusively to mithraic.space and ships with custom branding and a fully self-contained auto-update pipeline hosted on a private Forgejo instance.
 
-No reliance on external services. Updates come from `git.mithraic.cloud`. Builds run on a self-hosted CI runner. Everything stays in-house.
+Built on top of [Stoat for Desktop](https://github.com/stoatchat/for-desktop), which is itself built on the open-source [Revolt](https://revolt.chat) platform.
+
+No reliance on external services. Everything stays in-house.
 
 ---
 
@@ -25,11 +27,10 @@ Grab the latest build from the [Releases page](https://git.mithraic.cloud/ad3lai
 ### Linux
 
 ```bash
-# extract to your local apps folder
 mkdir -p ~/.local/share/sanctum
-unzip Sanctum-linux-x64-*.zip -d ~/.local/share/sanctum/
+unzip Sanctum-linux-x64-*.zip -d /tmp/sanctum-extract
+cp -rT /tmp/sanctum-extract/Sanctum-linux-x64 ~/.local/share/sanctum/
 
-# register it as a desktop app
 cat > ~/.local/share/applications/sanctum.desktop << EOF
 [Desktop Entry]
 Name=Sanctum
@@ -41,57 +42,16 @@ StartupWMClass=sanctum
 EOF
 ```
 
-Then search for **Sanctum** in your app launcher and you're in.
+Search for **Sanctum** in your app launcher and you're in.
 
 ### Windows
 
-Extract the zip, run `sanctum.exe`. That's it.
+Extract the zip, run `sanctum.exe`.
 
 ---
 
 ## Auto-updates
 
-Sanctum checks for new releases on every launch. When a newer version is available on `git.mithraic.cloud`, you'll get a desktop notification — click it to download. No background processes, no silent installs.
+Sanctum checks for updates on every launch. When a new version is available, you'll get a desktop notification — it downloads and installs in the background. Click the notification to restart into the new version.
 
----
+You can also trigger a manual check anytime from the tray icon → **Check for Updates**.
-
-## Building from source
-
-You'll need Git, Node.js, and pnpm (`corepack enable`).
-
-```bash
-git clone https://git.mithraic.cloud/ad3laid3/sanctum
-cd sanctum
-pnpm i --frozen-lockfile
-pnpm start
-```
-
-### Releasing a new build
-
-Push a version tag and CI does the rest — compiles Linux and Windows builds, creates a release, and uploads artifacts automatically.
-
-```bash
-git tag v1.x.x
-git push origin v1.x.x
-```
-
-### Building locally
-
-```bash
-# Linux (deb + zip)
-PLATFORM=linux pnpm make
-
-# Windows (zip, no Wine required)
-pnpm make --platform win32 --arch x64
-```
-
-Output lands in `out/make/`.
-
----
-
-## Tech
-
-- [Electron](https://www.electronjs.org/) + [electron-forge](https://www.electronforge.io/)
-- [Revolt](https://revolt.chat) open-source chat backend
-- [Forgejo](https://forgejo.org/) for self-hosted git + CI
-- Discord Rich Presence via [discord-rpc](https://github.com/discordjs/RPC)