Add redhat instructions

Author: shivammathur

include/download-instructions/linux-redhat-cli-community.php

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+<p>
+On the command line, run the following commands:
+</p>
+<pre><code class="language-bash line-numbers">
+# Add the Remi's RPM repository.
+sudo subscription-manager repos --enable codeready-builder-for-rhel-$(rpm -E %rhel)-$(arch)-rpms
+sudo dnf install -y dnf-plugins-core
+sudo dnf install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-$(rpm -E %rhel).noarch.rpm
+sudo dnf install -y https://rpms.remirepo.net/enterprise/remi-release-$(rpm -E %rhel).rpm
+sudo dnf module reset php -y
+sudo dnf module enable php:remi-<?= $version; ?> -y
+
+# Install PHP.
+sudo dnf install -y php
+</code></pre>

include/download-instructions/linux-redhat-cli-default.php

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+<p>
+On the command line, run the following commands:
+</p>
+<pre><code class="language-bash line-numbers">
+# Install PHP.
+sudo dnf install -y php
+</code></pre>

include/download-instructions/linux-redhat-web-community.php

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+linux-redhat-cli-community.php

include/download-instructions/linux-redhat-web-default.php

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+linux-redhat-cli-default.php