updated php, fixed typo, added firewall and docs

This commit updates the PHP version on several articles, which is currently 8.2 on Debian
It also uses symbolic links (such as `php-fpm.sock`) on nginx config files and dependency
packages (such as `php-mbstring`) that will always point to the most recent version of
PHP, so there is no need to change those once PHP is updated.

On places where the PHP version must be specified, such as the
`/etc/php/8.2/` directory and the `php8.2-fpm` systemd service, I have
changed the version accordingly.

I believe I have covered every instance of PHP usage on the website, and
programs should work fine. If I missed something or made a change that
broke the configuration of some program, please let me know.

Additionally, I have fixed a typo on mumble.md, which called the command
`scp` as `spc`, added a command to open the mumble port on your firewall
and added documentation links for further configuration of the server.

1 files changed, 2 insertions, 2 deletions

diff --git a/content/rainloop.md b/content/rainloop.md
index 97b59cb..b84413c 100644
--- a/content/rainloop.md
+++ b/content/rainloop.md
@@ -26,7 +26,7 @@ First we will install the required packages for Rainloop with the
 following command:
 
 ```sh
-apt-get install php7.4 php7.4-common php7.4-curl php7.4-xml php7.4-fpm php7.4-json php7.4-dev php7.4-mysql unzip -y
+apt-get install php php-common php-curl php-xml php-fpm php-json php-dev php-mysql unzip -y
 ```
 
 Then we will download the community version of Rainloop, unzip it into
@@ -65,7 +65,7 @@ server {
         fastcgi_index index.php;
         fastcgi_split_path_info ^(.+\.php)(.*)$;
         fastcgi_keep_conn on;
-        fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
+        fastcgi_pass unix:/var/run/php/php-fpm.sock;
         include /etc/nginx/fastcgi_params;
         fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
     }