chore: rewrite readme and taglines for plugin-based termix

packaging/flatpak/com.karmaa.termix.flatpakref

@@ -1,11 +1,11 @@
 [Flatpak Ref]
 Name=Termix
 Branch=stable
-Title=Termix - SSH Server Management Platform
+Title=Termix
 IsRuntime=false
 Url=https://github.com/Termix-SSH/Termix/releases/download/VERSION_PLACEHOLDER/termix_linux_flatpak.flatpak
 RuntimeRepo=https://flathub.org/repo/flathub.flatpakrepo
-Comment=Self-hosted SSH and remote desktop management.
-Description=Termix is an open-source, forever-free, self-hosted all-in-one server management platform. It provides a multi-platform solution for managing your servers and infrastructure through a single, intuitive interface. Termix offers SSH terminal access, remote desktop control (RDP, VNC, Telnet), SSH tunneling capabilities, remote file management, and many other tools. Termix is the perfect free and self-hosted alternative to Termius available for all platforms.
+Comment=Self-hosted, plugin-based server management.
+Description=Termix is a free, open source, self-hosted platform for managing your servers, built on plugins. The core keeps your hosts, credentials, users and sharing, and plugins add the SSH terminal, remote desktop (RDP, VNC, Telnet), file manager, tunnels, Docker, metrics and more. It runs on web, desktop and mobile, and it is a free, self-hosted alternative to Termius.
 Icon=https://raw.githubusercontent.com/Termix-SSH/Termix/main/public/icon.png
 Homepage=https://github.com/Termix-SSH/Termix