docs: add a little guide to install Vivaldi into Apx

I did the guide using a Ubuntu Container

_posts/2023-10-26-install-vivaldi.md

@@ -0,0 +1,86 @@
+---
+title: Installing Vivaldi
+description: Learn how to Install and set up Vivaldi in Vanilla OS. 
+date: 2023-10-26
+layout: article
+authors: 
+    - Phosphorus-M
+    - amsyarzero
+published: true
+---
+
+## Introduction
+
+[Vivaldi](https://vivaldi.com/) is a freeware, cross-platform web browser developed by Vivaldi Technologies, a company founded by Opera Software co-founder and former CEO Jon Stephenson von Tetzchner and Tatsuki Tomita. Vivaldi is based on Chromium, the open-source project behind Google Chrome. Vivaldi is intended to be a customizable, functional, and practical browser for the web.
+
+## Installing Vivaldi
+
+You can install Vivaldi using the following steps:
+
+First, download the latest version of Vivaldi from [here](https://vivaldi.com/download/).
+
+Use `cd` to navigate to the directory where the downloaded package is located.
+
+Then, install the downloaded package into your subsystem (In this case apt) using the following command:
+
+```bash
+apx install --sideload ./vivaldi-stable_*_amd64.deb
+```
+
+After the installation is complete but you must install the proprietary codecs needed for video and audio to play:
+
+```bash
+apx enter
+sudo apt-get update && sudo apt-get install chromium-codecs-ffmpeg-extra
+```
+
+## Installing Pipewire for Vivaldi (and basically any other subsystem program)
+
+This step is also important so your desktop knows how to route the audio properly to your audio devices.
+
+```bash
+sudo apt install pipewire-audio-client-libraries pipewire-pulse wireplumber
+exit
+```
+
+Don't forget export Vivaldi:
+```bash
+apx export vivaldi-stable
+```
+
+Now Vivaldi should be functioning perfectly!
+
+
+## Setup Vivaldi as your default browser
+
+To set Vivaldi as your default browser, open the terminal and run the following command:
+
+```bash
+cd ~/.local/share/applications
+xdg-settings set default-web-browser apx_managed-vivaldi-stable.desktop
+```
+This allows you to open links from other applications outside of the subsystem in Vivaldi.
+
+Inside of a subsystem, you can also use the following command:
+
+```bash
+xdg-settings set default-web-browser vivaldi-stable
+```
+
+This allows you to open links from other applications inside of the subsystem in Vivaldi.
+
+## Credits
+
+This guide was recompilation of messages in discord and [the installation guide into the Arch subsystem](https://gist.github.com/amsyarzero/4b52f44d7b74d3e61b42028e6c8aeaa7) of [amsyarzero](https://github.com/amsyarzero).
+Vanilla OS community (hyperlink leads to their Discord) for patiently answering my noob questions, especially:
+- Feng Lengshun
+- Dharun Krishna
+- Monster
+- xrandr
+
+## Limitations
+
+- A new Vivaldi icon will open for each window, regardless of whether the icon in the Application Menu is pinned to the dock or not.
+
+![Vivaldi in the dock](/assets/uploads/Miscellaneous/vivaldi-dock.webp)
+