docs: add documentation to the repo and improve layout

DEPLOY_FROM_SOURCE.md

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+# Deploy from source
+
+## Prerequisites
+
+Make sure you have `libssl-dev` and `pkg-config` installed and the [rust toolchain](https://rustup.rs) is available on at least on user.
+
+
+## Install Conduit
+
+```bash
+$ sudo useradd -m conduit
+$ sudo -u conduit cargo install --git "https://git.koesters.xyz/timo/conduit.git"
+```
+
+
+## Setup systemd service
+
+In this guide, we set up a systemd service for Conduit, so it's easy to start, stop Conduit and set it to autostart when your server reboots. Paste the default systemd service below and configure it to fit your setup (in /etc/systemd/system/conduit.service).
+
+```systemd
+[Unit]
+Description=Conduit
+After=network.target
+
+[Service]
+Environment="ROCKET_SERVER_NAME=conduit.rs" # EDIT THIS
+
+Environment="ROCKET_PORT=14004" # Reverse proxy port
+
+#Environment="ROCKET_REGISTRATION_DISABLED=true"
+#Environment="ROCKET_LOG=normal" # Detailed logging
+
+Environment="ROCKET_ENV=production"
+User=conduit
+Group=conduit
+Type=simple
+Restart=always
+ExecStart=/home/conduit/.cargo/bin/conduit
+
+[Install]
+WantedBy=multi-user.target
+```
+
+Finally, run
+```bash
+$ sudo systemctl daemon-reload
+```
+
+
+## Setup Reverse Proxy
+
+This depends on whether you use Apache, Nginx or something else. For Apache it looks like this (in /etc/apache2/sites-enabled/050-conduit.conf):
+```
+<VirtualHost *:443>
+
+ServerName conduit.koesters.xyz # EDIT THIS
+
+AllowEncodedSlashes NoDecode
+
+ServerAlias conduit.koesters.xyz # EDIT THIS
+
+ProxyPreserveHost On
+ProxyRequests off
+AllowEncodedSlashes NoDecode
+ProxyPass / http://localhost:14004/ nocanon
+ProxyPassReverse / http://localhost:14004/ nocanon
+
+Include /etc/letsencrypt/options-ssl-apache.conf
+
+# EDIT THESE:
+SSLCertificateFile /etc/letsencrypt/live/conduit.koesters.xyz/fullchain.pem
+SSLCertificateKeyFile /etc/letsencrypt/live/conduit.koesters.xyz/privkey.pem
+</VirtualHost>
+```
+
+Then run
+```bash
+$ sudo systemctl reload apache2
+```
+
+
+## SSL Certificate
+
+The easiest way to get an SSL certificate for the domain is to install `certbot` and run this:
+```bash
+$ sudo certbot -d conduit.koesters.xyz
+```
+
+
+## You're done!
+
+Now you can start Conduit with
+```bash
+$ sudo systemctl start conduit
+```
+
+and set it to start automatically when your system boots with
+```bash
+$ sudo systemctl enable conduit
+```