docs: Update README

Mention Hack manifest
Fix flatpak removal instructions
Remove link to unsupported Snap
Fix mentions of Fractal Next
Make translation instructions accurate
Update Flathub's button size and alt text

README.md

@@ -20,9 +20,9 @@ over and build Fractal with all the features (e.g end-to-end encryption) we have
 
 A year ago we started working on rewriting [Fractal](https://gitlab.gnome.org/GNOME/fractal/) from
 scratch using [GTK4](https://www.gtk.org/) and the [matrix-rust-sdk](https://github.com/matrix-org/matrix-rust-sdk).
-This effort was called Fractal-next.
+This effort was called Fractal Next.
 
-Fractal-next now replaced our previous codebase, and has become the new nightly version. It isn't
+Fractal Next now replaced our previous codebase, and has become the new nightly version. It isn't
 yet ready for a release and you can follow along our progress towards it by looking at the
 [feature parity](https://gitlab.gnome.org/GNOME/fractal/-/milestones/18) and
 [Fractal v5 (fractal-next)](https://gitlab.gnome.org/GNOME/fractal/-/milestones/21) milestones.
@@ -31,22 +31,22 @@ yet ready for a release and you can follow along our progress towards it by look
 
 ### Stable version
 
-Flatpak is the recommended installation method. Until Fractal-next is ready, you can get the official
-Fractal Flatpak on Flathub.
+The current stable version is 4.4.0 (released August 2020).
 
-<a href="https://flathub.org/apps/details/org.gnome.Fractal">
-<img src="https://flathub.org/assets/badges/flathub-badge-i-en.png" width="190px" />
-</a>
+Flatpak is the recommended installation method.
+Until our next iteration is ready, you can get the official Fractal Flatpak on Flathub.
 
-Fractal can also be installed as a snap on any distro with snap support enabled
-
-<a href="https://snapcraft.io/fractal">
-<img src="https://github.com/snapcore/snap-store-badges/raw/master/EN/[EN]-snap-store-white.png" width="182px" />
+<a href="https://flathub.org/apps/details/org.gnome.Fractal">
+<img
+    src="https://flathub.org/assets/badges/flathub-badge-i-en.png"
+    alt="Download Fractal on Flathub"
+    width="240px"
+/>
 </a>
 
 ### Development version
 
-If you want to try Fractal-next without building it yourself, it is available as a nightly Flatpak
+If you want to try Fractal Next without building it yourself, it is available as a nightly Flatpak
 in the gnome-nightly repo.
 
 ```sh
@@ -86,6 +86,14 @@ flatpak install --user flathub org.freedesktop.Sdk.Extension.rust-stable//21.08
 flatpak install --user flathub org.freedesktop.Sdk.Extension.llvm12//21.08
 ```
 
+<table><tr><td>
+<p>ℹ️ The instructions below will build the same binary as the one available on the GNOME nightly
+repo. This is an optimised build so it can take a few minutes.</p>
+
+<p>If you're building Fractal for development, use the <code>org.gnome.Fractal.Hack.json</code> manifest
+instead.</p>
+</td></tr></table>
+
 Move inside the `build-aux` folder and then build and install the app:
 
 ```sh
@@ -96,13 +104,13 @@ flatpak-builder --user --install app org.gnome.Fractal.Devel.json
 Fractal Next can then be entirely removed from your system with:
 
 ```sh
-flatpak remove org.gnome.Fractal.Devel.json
+flatpak remove --delete-data org.gnome.Fractal.Devel
 ```
 
 ### GNU/Linux
 
-If you decide to ignore our recommendation and build on your host system, outside of Flatpak or
-snap, you will need Meson and Ninja (as well as Rust and Cargo).
+If you decide to ignore our recommendation and build on your host system,
+outside of Flatpak, you will need Meson and Ninja (as well as Rust and Cargo).
 
 ```sh
 meson . _build --prefix=/usr/local
@@ -114,10 +122,7 @@ sudo ninja -C _build install
 
 Fractal is translated by the GNOME translation team on [Damned lies](https://l10n.gnome.org/).
 
-If you want to add *a new language* you should update the file `fractal-gtk/po/LINGUAS` and add the
-code for that language to the list.
-
-Get the pot file from [the Fractal module page on Damned lies](https://l10n.gnome.org/module/fractal/).
+Find your language in the list on [the Fractal module page on Damned lies](https://l10n.gnome.org/module/fractal/).
 
 ### Password Storage
 
@@ -129,7 +134,7 @@ using GNOME or KDE this should work for you out of the box with gnome-keyring or
 
 * Does Fractal have encryption support? Will it ever?
 
-Yes, Fractal-next has encryption support using Cross-Signing. See
+Yes, the current development version (`main` branch) has encryption support using Cross-Signing. See
 <https://gitlab.gnome.org/GNOME/fractal/-/issues/717> for more info on the state of encryption.
 
 * Can I run Fractal with the window closed?
@@ -139,11 +144,11 @@ guidelines and paradigms. This will be revisited if or when GNOME gets a "Do Not
 
 ## The origin of Fractal
 
-Fractal-next is a complete rewrite of Fractal built on top of the
+The development version is a complete rewrite of Fractal built on top of the
 [matrix-rust-sdk](https://github.com/matrix-org/matrix-rust-sdk) using [GTK4](https://gtk.org/).
 
 The previous version of Fractal was using GTK3 and its own backend to talk to a matrix homeserver,
-the code can be found in the [legacy](https://gitlab.gnome.org/GNOME/fractal/-/tree/legacy) branch.
+the code can be found in the [`legacy` branch](https://gitlab.gnome.org/GNOME/fractal/-/tree/legacy).
 
 Initial versions were based on Fest <https://github.com/fest-im/fest>, formerly called ruma-gtk.
 In the origins of the project it was called guillotine, based on French revolution, in relation with