Move installation scripts to install/ dir

install/vivaldi.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+set -E -o errexit -o nounset -o pipefail
+set -x
+
+wget -qO- https://repo.vivaldi.com/archive/linux_signing_key.pub | gpg --dearmor | sudo dd of=/usr/share/keyrings/vivaldi-browser.gpg
+echo "deb [signed-by=/usr/share/keyrings/vivaldi-browser.gpg arch=$(dpkg --print-architecture)] https://repo.vivaldi.com/archive/deb/ stable main" | sudo dd of=/etc/apt/sources.list.d/vivaldi-archive.list
+sudo apt update
+sudo apt install vivaldi-stable