docs: add UPDATE.md for updating instructions + update README.md

.rsync-filter

@@ -10,4 +10,5 @@
 + LICENSE.md
 + README.md
 + INSTALL.md
++ UPDATE.md
 - **

README.md

@@ -1,4 +1,9 @@
-# ![Castopod Host](https://podlibre.org/static/images/Castopod-Title.svg)
+<h1 style="text-align: center">
+  <img src="https://podlibre.org/static/images/Castopod-Title.svg" alt="Castopod Host" />
+</h1>
+
+> ⚠️ **Castopod Host is in alpha version**. It is still under heavy development
+> and may not be 100% stable as new features are being worked on.
 
 _Castopod Host_ is a free and open-source podcast hosting solution made for
 podcasters who want engage and interact with their audience.
@@ -9,20 +14,26 @@ audience measurements that respect your listeners privacy.
 Whether you choose to install it on your own server or have it hosted by a
 professional, all your data and analytics belong to you and you only!
 
-![Castopod Mascot](https://podlibre.org/static/images/Castopod-Mascot-Server.svg)
+<div style="text-align: center">
+  <img src="https://podlibre.org/static/images/Castopod-Mascot-Server.svg" alt="Castopod Mascot" />
+</div>
 
 You may find Castopod Host's source code on the
 [original repository](https://code.podlibre.org/podlibre/castopod-host) or,
 alternatively, on the
 [github repository (mirror)](https://github.com/podlibre/castopod-host).
 
-## Installation
+## Install / Update
 
-To install Castopod Host on your PHP/MySQL server:
+To install or update Castopod Host on your PHP/MySQL server:
 
 - Download
-  [Castopod Host's latest Package (zip or tar.gz)](https://code.podlibre.org/podlibre/castopod-host/-/releases),
-- Follow the procedure on “[How to install Castopod Host](./INSTALL.md)”.
+  [Castopod Host's latest Package (zip or tar.gz)](https://code.podlibre.org/podlibre/castopod-host/-/releases):
+
+- Follow one of the procedures on:
+
+  - [“How to **install** Castopod Host”](./INSTALL.md)
+  - or [“How to **update** Castopod Host”](./UPDATE.md)
 
 ## Documentation
 

UPDATE.md

@@ -0,0 +1,91 @@
+# How to update Castopod Host <!-- omit in toc -->
+
+After installing _Castopod Host_, you may want to update your instance to the
+latest version in order to enjoy the latest features ✨, bug fixes 🐛 and
+performance improvements ⚡.
+
+## Table of contents <!-- omit in toc -->
+
+- [Manual update instructions](#manual-update-instructions)
+- [Automatic update instructions](#automatic-update-instructions)
+- [Frequently asked questions (FAQ)](#frequently-asked-questions-faq)
+  - [Where can I find my _Castopod Host_ version?](#where-can-i-find-my-castopod-host-version)
+  - [I haven't updated my instance in a long time… What should I do?](#i-havent-updated-my-instance-in-a-long-time-what-should-i-do)
+  - [Should I make a backup before updating?](#should-i-make-a-backup-before-updating)
+
+## Manual update instructions
+
+1. Go to the
+   [releases page](https://code.podlibre.org/podlibre/castopod-host/-/releases)
+   and see if your instance is up to date with the latest _Castopod Host_
+   version
+
+   - cf.
+     [Where can I find my _Castopod Host_ version?](#where-can-i-find-my-castopod-host-version)
+
+2. Download the latest release package named `Castopod Host Package`, you may
+   choose between the `zip` or `tar.gz` archives
+
+   - ⚠️ Make sure you download the Castopod Host Package and **NOT** the Source
+     Code
+
+3. On your server:
+
+   - Remove all files except `.env` and `public/media`
+   - Copy the new files from the downloaded package into your server
+
+4. Alpha releases may come with additional update instructions (see
+   [releases page](https://code.podlibre.org/podlibre/castopod-host/-/releases)).
+   They are usually database migration scripts in `.sql` format to update your
+   database schema.
+
+   - 👉 Make sure you run the scripts on your phpmyadmin panel or using command
+     line to update the database along with the package files!
+   - cf.
+     [I haven't updated my instance in a long time… What should I do?](#i-havent-updated-my-instance-in-a-long-time-what-should-i-do)
+
+5. ✨ Enjoy your fresh instance, you're all done!
+
+## Automatic update instructions
+
+> Coming soon... 👀
+
+## Frequently asked questions (FAQ)
+
+### Where can I find my _Castopod Host_ version?
+
+Go to your _Castopod Host_ admin panel, the version is displayed on the bottom
+right corner.
+
+Alternatively, you can find the version in the `app > Config > Constants.php`
+file.
+
+### I haven't updated my instance in a long time… What should I do?
+
+No problem! Just get the latest release as described above. Only, when going
+through the release instructions (4), perform them sequentially, from the oldest
+to the newest.
+
+> You may want to backup your instance depending on how long you haven't updated
+> _Castopod Host_.
+
+For example, if you're on `v1.0.0-alpha.42` and would like to upgrade to
+`v1.0.0-alpha.58`:
+
+0. (recommended) Make a backup of your files and database.
+
+1. Download the latest release, overwrite your files whilst keeping `.env` and
+   `public/media`.
+
+2. Go through each release update instructions sequentially (from oldest to
+   newest) starting with `v1.0.0-alpha.43`, `v1.0.0-alpha.44`,
+   `v1.0.0-alpha.45`, …, `v1.0.0-alpha.58`.
+
+3. ✨ Enjoy your fresh instance, you're all done!
+
+### Should I make a backup before updating?
+
+We advise you do, so you don't lose everything if anything goes wrong!
+
+More generally, we advise you make regular backups of your Castopod Host files
+and database to prevent you from losing it all…