Updating deployment instructions

Update staging deployment yaml to use a common SSH key for all deployments to allow more granular access control server-side. Adding production deployment instructions.

.gitea/workflows/release.yml

@@ -0,0 +1,22 @@
+name: Deploy to production webserver
+run-name: ${{ gitea.actor }} is deploying to staging environment
+on:
+  push:
+      branches: [ staging ]
+  workflow_dispatch:
+
+jobs:
+  Deploy-To-Staging:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v4
+      - name: Deploy via SFTP
+        uses: appleboy/scp-action@master
+        with:
+          host: ${{ secrets.PRODUCTION_SFTP_HOST }}
+          username: ${{ secrets.PRODUCTION_SFTP_USERNAME }}
+          key: ${{ secrets.SSH_PRIVATE_KEY }}
+          source: "public_html/"
+          target: "~/web/son-williams.ca/public_html/"
+          strip_components: 1