doc: prepare for commonmark

We are still using Pandoc’s Markdown parser, which differs from CommonMark spec slightly.

Notably:
- Line breaks in lists behave differently.
- Admonitions do not support the simpler syntax https://github.com/jgm/commonmark-hs/issues/75
- The auto_identifiers uses a different algorithm – I made the previous ones explicit.
- Languages (classes) of code blocks cannot contain whitespace so we have to use “pycon” alias instead of Python “console” as GitHub’s linguist

While at it, I also fixed the following issues:
- ShellSesssion was used
- Removed some pointless docbook tags.

3 files changed, 5 insertions, 5 deletions

diff --git a/doc/builders/images/appimagetools.section.md b/doc/builders/images/appimagetools.section.md
index 7ab4e4e9d855f..67e63dc5f61af 100644
--- a/doc/builders/images/appimagetools.section.md
+++ b/doc/builders/images/appimagetools.section.md
@@ -2,7 +2,7 @@
 
 `pkgs.appimageTools` is a set of functions for extracting and wrapping [AppImage](https://appimage.org/) files. They are meant to be used if traditional packaging from source is infeasible, or it would take too long. To quickly run an AppImage file, `pkgs.appimage-run` can be used as well.
 
-::: warning
+::: {.warning}
 The `appimageTools` API is unstable and may be subject to backwards-incompatible changes in the future.
 :::
 
diff --git a/doc/builders/images/dockertools.section.md b/doc/builders/images/dockertools.section.md
index 2d21eb1c2e07e..bfe1d17a60674 100644
--- a/doc/builders/images/dockertools.section.md
+++ b/doc/builders/images/dockertools.section.md
@@ -1,6 +1,6 @@
 # pkgs.dockerTools {#sec-pkgs-dockerTools}
 
-`pkgs.dockerTools` is a set of functions for creating and manipulating Docker images according to the [ Docker Image Specification v1.2.0 ](https://github.com/moby/moby/blob/master/image/spec/v1.2.md#docker-image-specification-v120). Docker itself is not used to perform any of the operations done by these functions.
+`pkgs.dockerTools` is a set of functions for creating and manipulating Docker images according to the [Docker Image Specification v1.2.0](https://github.com/moby/moby/blob/master/image/spec/v1.2.md#docker-image-specification-v120). Docker itself is not used to perform any of the operations done by these functions.
 
 ## buildImage {#ssec-pkgs-dockerTools-buildImage}
 
@@ -52,7 +52,7 @@ The above example will build a Docker image `redis/latest` from the given base i
 
 > **_NOTE:_** Using this parameter requires the `kvm` device to be available.
 
-- `config` is used to specify the configuration of the containers that will be started off the built image in Docker. The available options are listed in the [ Docker Image Specification v1.2.0 ](https://github.com/moby/moby/blob/master/image/spec/v1.2.md#image-json-field-descriptions).
+- `config` is used to specify the configuration of the containers that will be started off the built image in Docker. The available options are listed in the [Docker Image Specification v1.2.0](https://github.com/moby/moby/blob/master/image/spec/v1.2.md#image-json-field-descriptions).
 
 After the new layer has been created, its closure (to which `contents`, `config` and `runAsRoot` contribute) will be copied in the layer itself. Only new dependencies that are not already in the existing layers will be copied.
 
diff --git a/doc/builders/images/snaptools.section.md b/doc/builders/images/snaptools.section.md
index 9e1403b88285a..5f710d2de7fe0 100644
--- a/doc/builders/images/snaptools.section.md
+++ b/doc/builders/images/snaptools.section.md
@@ -14,7 +14,7 @@ Currently, `makeSnap` does not support creating GUI stubs.
 
 The following expression packages GNU Hello as a Snapcraft snap.
 
-```{#ex-snapTools-buildSnap-hello .nix}
+``` {#ex-snapTools-buildSnap-hello .nix}
 let
   inherit (import <nixpkgs> { }) snapTools hello;
 in snapTools.makeSnap {
@@ -35,7 +35,7 @@ in snapTools.makeSnap {
 
 Graphical programs require many more integrations with the host. This example uses Firefox as an example, because it is one of the most complicated programs we could package.
 
-```{#ex-snapTools-buildSnap-firefox .nix}
+``` {#ex-snapTools-buildSnap-firefox .nix}
 let
   inherit (import <nixpkgs> { }) snapTools firefox;
 in snapTools.makeSnap {