Improved documentation

docs/installation/nginx.md

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+---
+title: Nginx
+layout: default
+parent: Installation
+nav_order: 10
+---
+
+# Nginx
+You can also use [nginx](https://www.nginx.com/) as webserver for Part-DB. Setup Part-DB with apache is a bit easier, so
+this is the method shown in the guides. This guide assumes that you already have a working nginx installation with PHP
+configured.
+
+## Setup
+1. Install composer and yarn like described in the [apache guide]({% link installation/installation_guide-debian.md %}#install-composer).
+2. Create a folder for Part-DB and install and configure it as described
+3. Instead of creating the config for apache, add the following snippet to your nginx config:
+```nginx
+server {
+    # Redirect all HTTP requests to HTTPS
+    listen 80;
+    # Change this to your domain
+    server_name parts.example.com;
+    return 301 https://$host$request_uri;
+}
+server {
+#   listen 80;
+    listen 443 ssl;
+    
+    # Change this to your domain
+    server_name parts.example.com;
+    # /var/www/partdb/ should be the path to the folder where you installed Part-DB
+    root /var/www/partdb/public;
+
+    location / {
+        try_files $uri /index.php$is_args$args;
+    }
+
+    location ~ ^/index\.php(/|$) {
+        fastcgi_pass unix:/var/run/php/php-fpm.sock;
+        fastcgi_split_path_info ^(.+\.php)(/.+)$;
+        include fastcgi_params;
+        fastcgi_param SCRIPT_FILENAME $realpath_root$fastcgi_script_name;
+        fastcgi_param DOCUMENT_ROOT $realpath_root;
+
+        internal;
+    }
+
+    location ~ \.php$ {
+        return 404;
+    }
+
+    error_log /var/log/nginx/parts.error.log;
+    access_log /var/log/nginx/parts.access.log;
+
+    # SSL parameters
+    ssl_certificate /var/www/certs/SSL/domain.cert.pem;
+    ssl_certificate_key /var/www/certs/SSL/private.key.pem;
+    ssl_trusted_certificate /var/www/certs/SSL/intermediate.cert.pem;
+
+    ssl_session_timeout 5m;
+
+    ssl_protocols TLSv1.2;
+    ssl_ciphers HIGH:!aNULL:!MD5;
+    ssl_prefer_server_ciphers on;
+}
+```
+4. Restart nginx with `sudo systemctl restart nginx` and you should be able to access Part-DB under your configured domain.