docs(whp): add reference + 5 add-on articles, env.d.ts for font CSS imports

src/content/docs/whp/add-ons/resource-upgrades.mdx

@@ -0,0 +1,50 @@
+---
+title: Resource upgrades
+description: Add CPU, RAM, or disk to your container without migrating to a different plan.
+sidebar:
+  order: 4
+---
+
+import PaidAddon from '~/content/partials/paid-addon-callout.mdx';
+import Support from '~/content/partials/support-link.mdx';
+
+<PaidAddon />
+
+## What it does
+
+Boost your container's **CPU**, **RAM**, or **persistent disk** without migrating to a new plan. Useful when you've outgrown your base allocation but the next plan tier up is more than you actually need.
+
+## What you can upgrade
+
+Each resource is independent — upgrade only what you need.
+
+- **CPU cores** — add cores for sustained-compute workloads.
+- **RAM** — for memory-hungry apps (caches, large WordPress sites with many plugins, Node apps holding big in-memory state).
+- **Persistent disk** — for sites that store a lot of files (media libraries, user uploads, backups outside our managed backup).
+
+## When you might need this
+
+- **High CPU on busy days.** Your **Overview → Resource usage** chart consistently hits the cap during peak hours.
+- **"Out of memory" errors** in your app log or `dmesg`.
+- **Disk usage approaching 80%** of your allocation — get ahead of it; full disks cause backup failures and uploads to fail.
+
+## How to enable
+
+From the [client portal](https://secure.anhonesthost.com/clientarea.php), open your hosting service → **Upgrade/Downgrade** → pick the resource amount. WHP applies the change usually within a minute, no downtime.
+
+## See your current usage
+
+In WHP, sidebar: **Overview → Resource usage**.
+
+![WHP Resource Usage page](~/assets/screenshots/whp/whp-resources.png)
+
+The chart shows CPU, RAM, and disk over the last 24 hours and 7 days. If you're consistently above 80% of any line, that's the one to upgrade.
+
+## Related
+
+- [Monitoring (AI Monitor)](/whp/add-ons/monitoring/) — catches resource saturation before customers complain.
+- [Add-ons overview](/whp/add-ons/overview/)
+
+## Still stuck?
+
+<Support />