Create layer 'apache' (#15812)

* Create layer 'apache'

* Replace 'nginx' with 'apache'

layers/+tools/apache/README.org

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+#+TITLE: apache layer
+
+#+TAGS: layer|tool
+
+[[file:img/apache.png]]
+
+* Table of Contents                     :TOC_5_gh:noexport:
+- [[#description][Description]]
+  - [[#features][Features:]]
+- [[#install][Install]]
+
+* Description
+This layer adds support for configuring the [[https://httpd.apache.org/][Apache]] web server.
+
+** Features:
+- Syntax highlighting of apache configuration files via [[https://github.com/emacs-php/apache-mode][apache-mode]].
+- Syntax-aware indentation
+
+* Install
+To use this configuration layer, add it to your =~/.spacemacs=. You will need to
+add =apache= to the existing =dotspacemacs-configuration-layers= list in this
+file.

layers/+tools/apache/packages.el

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+;;; packages.el --- apache layer packages file for Spacemacs.
+;;
+;; Copyright (c) 2012-2022 Sylvain Benner & Contributors
+;;
+;; Author: Nathaniel Waisbrot <code@waisbrot.net>
+;; URL: https://github.com/syl20bnr/spacemacs
+;;
+;; This file is not part of GNU Emacs.
+;;
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+;;
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+(defconst apache-packages '(apache-mode))
+
+(defun apache/init-apache-mode()
+  (use-package apache-mode :defer t))