Make README.md point to INSTALL.md for instructions

Our repo's README.md should point to our INSTALL.md for installation
instructions, and not the other way around. This fixes an issue with
INSTALL.md pointing to a stale README.md version. Updating our README
before tagging is not possible, since the latest version is the one that
our users visit, and it can't point to download links that do not exist.

Fixes #1003

INSTALL.md

@@ -1,8 +1,21 @@
 ## MacOS
-See instructions in [README.md](README.md#macos).
+
+- Download [Dangerzone 0.8.0 for Mac (Apple Silicon CPU)](https://github.com/freedomofpress/dangerzone/releases/download/v0.8.0/Dangerzone-0.8.0-arm64.dmg)
+- Download [Dangerzone 0.8.0 for Mac (Intel CPU)](https://github.com/freedomofpress/dangerzone/releases/download/v0.8.0/Dangerzone-0.8.0-i686.dmg)
+
+You can also install Dangerzone for Mac using [Homebrew](https://brew.sh/): `brew install --cask dangerzone`
+
+> **Note**: you will also need to install [Docker Desktop](https://www.docker.com/products/docker-desktop/).
+> This program needs to run alongside Dangerzone at all times, since it is what allows Dangerzone to
+> create the secure environment.
 
 ## Windows
-See instructions in [README.md](README.md#windows).
+
+- Download [Dangerzone 0.8.0 for Windows](https://github.com/freedomofpress/dangerzone/releases/download/v0.8.0/Dangerzone-0.8.0.msi)
+
+> **Note**: you will also need to install [Docker Desktop](https://www.docker.com/products/docker-desktop/).
+> This program needs to run alongside Dangerzone at all times, since it is what allows Dangerzone to
+> create the secure environment.
 
 ## Linux
 On Linux, Dangerzone uses [Podman](https://podman.io/) instead of Docker Desktop for creating

README.md

@@ -12,27 +12,15 @@ _Read more about Dangerzone in the [official site](https://dangerzone.rocks/abou
 
 ## Getting started
 
-### MacOS
-- Download [Dangerzone 0.8.0 for Mac (Apple Silicon CPU)](https://github.com/freedomofpress/dangerzone/releases/download/v0.8.0/Dangerzone-0.8.0-arm64.dmg)
-- Download [Dangerzone 0.8.0 for Mac (Intel CPU)](https://github.com/freedomofpress/dangerzone/releases/download/v0.8.0/Dangerzone-0.8.0-i686.dmg)
-
-You can also install Dangerzone for Mac using [Homebrew](https://brew.sh/): `brew install --cask dangerzone`
-
-> **Note**: you will also need to install [Docker Desktop](https://www.docker.com/products/docker-desktop/).
-> This program needs to run alongside Dangerzone at all times, since it is what allows Dangerzone to
-> create the secure environment.
-
-### Windows
-
-- Download [Dangerzone 0.8.0 for Windows](https://github.com/freedomofpress/dangerzone/releases/download/v0.8.0/Dangerzone-0.8.0.msi)
-
-> **Note**: you will also need to install [Docker Desktop](https://www.docker.com/products/docker-desktop/).
-> This program needs to run alongside Dangerzone at all times, since it is what allows Dangerzone to
-> create the secure environment.
-
-### Linux
-
-See [installing Dangerzone](INSTALL.md#linux) for adding the Linux repositories to your system.
+Follow the instructions for each platform:
+
+* [macOS](https://github.com/freedomofpress/dangerzone/blob/v0.8.0//INSTALL.md#macos).
+* [Windows](https://github.com/freedomofpress/dangerzone/blob/v0.8.0//INSTALL.md#macos).
+* [Ubuntu Linux](https://github.com/freedomofpress/dangerzone/blob/v0.8.0/INSTALL.md#ubuntu-debian)
+* [Debian Linux](https://github.com/freedomofpress/dangerzone/blob/v0.8.0/INSTALL.md#ubuntu-debian)
+* [Fedora Linux](https://github.com/freedomofpress/dangerzone/blob/v0.8.0/INSTALL.md#fedora)
+* [Qubes OS (beta)](https://github.com/freedomofpress/dangerzone/v0.8.0/main/INSTALL.md#qubes-os)
+* [Tails](https://github.com/freedomofpress/dangerzone/blob/v0.8.0/INSTALL.md#tails)
 
 ## Some features