Remove obsolete "pacman-website" playbook

Fixes: c4f13d3a ("archweb: Redirect /pacman/ to new pacman subdomain[1]")

playbooks/tasks/pacman-website.yml

-- name: Update pacman website
-  hosts: localhost
-  vars:
-    pacman_version: '6.0.1'
-    pacman_dir: '/srv/http/archweb/archlinux.org/pacman'
-  tasks:
-    - name: Create temp dir
-      tempfile: state=directory suffix=pacman
-      register: tempdir
-
-    - name: Fetch pacman tarball
-      get_url: url=https://sources.archlinux.org/other/pacman/pacman-{{ pacman_version }}.tar.xz dest={{ tempdir.path }}/pacman.tar.xz
-
-    - name: Unpack tarball
-      unarchive: src={{ tempdir.path }}/pacman.tar.xz dest={{ tempdir.path }}
-
-    - name: Build website
-      command: "{{ item }}"
-      args:
-        chdir: "{{ tempdir.path }}/pacman-{{ pacman_version }}"
-      loop:
-        - meson -Ddoc=enabled build
-        - ninja -C build doc/website.tar.gz
-
-    - block:
-      - name: Create website directory
-        file: state=directory owner=root group=root mode=0755 path={{ pacman_dir }}
-
-      - name: Upload website
-        unarchive:
-          src: "{{ tempdir.path }}/pacman-{{ pacman_version }}/build/doc/website.tar.gz"
-          dest: "{{ pacman_dir }}"
-          owner: nobody
-          group: nobody
-      delegate_to: archlinux.org