message: docs: add solus in ToC
diff: @@ -23,6 +23,7 @@ A cross-platform graphical process/system monitor with a customizable interface
  - [Fedora/CentOS](#fedoracentos)
  - [Gentoo](#gentoo)
  - [Nix](#nix)
  + - [Solus](#solus)
  - [Homebrew](#homebrew)
  - [Scoop](#scoop)
  - [Chocolatey](#chocolatey)
  