Remove the Makefile

Unfortunately, that is now useless since the Caddyfile does not exist in
its final form.

Author: QuLogic

Makefile

@@ -4,13 +4,6 @@ matplotlib.org Hosting
 This repo enables matplotlib.org hosting using
 [Caddy](https://caddyserver.com/).
 
-By default, Caddy is run in a container using `make serve`, which:
-
-* Runs Caddy (version can be overridden by setting `CADDY_VERSION`) in
-  [podman](https://podman.io/) (can be switched to docker by setting `RUNTIME`)
-* Mounts Matplotlib documentation repositories from the  `sites` subdirectory
-* Exposes the server on port 2015
-
 Hosted repositories
 -------------------
 
@@ -29,18 +22,6 @@ related projects are also exposed as toplevel directories:
 * [mpl-gui](https://github.com/matplotlib/mpl-gui)
 * [mpl-third-party](https://github.com/matplotlib/mpl-third-party)
 
-Caddy options
--------------
-
-The Makefile will set these options for you when mounting and running the
-container, but if you wish to run Caddy directly, you may wish to set some
-overrides in environment variables:
-
-* The host and port with `SITE_ADDRESS` (defaults to port 2015 on all
-  interfaces)
-* The directory containing the git repositories with `SITE_DIR` (defaults to
-  `sites` in the current directory)
-
 Ansible configuration
 =====================