docs: add a little guide to install Vivaldi into Apx

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

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+---
+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 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
+
+First, download the latest version of Vivaldi from [**here**](https://vivaldi.com/download/).
+
+Execute the following command to access to the directory where the downloaded package is located:
+
+```bash
+cd ~/Downloads
+```
+
+Then, install the downloaded package into your subsystem using the following command:
+
+```bash
+apx install --sideload ./vivaldi-stable_*_amd64.deb
+```
+
+After the installation is complete, you must install the proprietary codecs needed for video and audio to play:
+
+```bash
+apx enter
+sudo apt update && sudo apt install chromium-codecs-ffmpeg-extra
+```
+
+Run the following command to install the required components for functioning audio:
+
+```bash
+sudo apt install pipewire-audio-client-libraries pipewire-pulse wireplumber
+exit
+```
+
+You can now create a desktop entry for Vivaldi with:
+
+```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 commands:
+
+```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.
+
+## 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)