docs: add website server management docs

src/content/docs/add-user.md

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+```
+# ssh into the server
+ssh [server ip]
+
+# add new admin
+sudo adduser [username]
+sudo usermod -aG sudo [username]
+
+# confirm it works
+id [username]
+
+# add to AllowUsers setting for ssh access
+sudo vim /etc/ssh/sshd_config
+sudo systemctl reload ssh
+
+# add their public ssh key
+sudo su - [username]
+mkdir -p ~/.ssh && chmod 700 ~/.ssh && touch ~/.ssh/authorized_keys && chmod 600 ~/.ssh/authorized_keys
+vim ./.ssh/authorized_keys
+exit
+
+# optionally log out of the server
+exit
+```
+

src/content/docs/deploy-website.md

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+```
+# ssh into the server
+ssh [ip address]
+
+# change to the deploy user
+sudo su - deploy
+
+# update the relevant branch
+cd ./next-website-v2/
+git branch
+git checkout main # or the branch you want
+git pull
+yarn install
+
+# build and deploy the site
+yarn build
+pm2 list
+pm2 restart 0 # or id of instance you want to restart
+
+# visit the site to make sure it works
+
+# log out of the deploy user, and optionally the server
+exit
+exit
+``
+