Add netlify.toml with build config (#11)

## Summary

- Adds `netlify.toml` with Hugo build command, publish directory, and
cache headers
- Sets `base = "/"` so Netlify runs Hugo from the repo root (not
`docs/`)
- Fixes `warnidf` call in `layouts/_partials/event.ics` — replaced with
`warnf` for compatibility with Hugo < 0.123

## Test plan

- [ ] Netlify deploy preview builds successfully
- [ ] `public/` is used as the publish directory

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: HeyItsGilbert

layouts/_partials/event.ics

@@ -1,5 +1,5 @@
 {{- /* Override of component event.ics — uses .Site.Language.Lang instead of .Locale (requires Hugo 0.159+) */ -}}
-{{- if or (eq hugo.Environment "development") (eq hugo.Environment "debug") }}{{ warnidf "debug-partial-used" "Partial used: %s" templates.Current.Name }}{{ end -}}
+{{- if or (eq hugo.Environment "development") (eq hugo.Environment "debug") }}{{ warnf "Partial used: %s" templates.Current.Name }}{{ end -}}
 {{- $timezone := partial "ical/get_timezone.ics" . -}}
 {{- $lang := .Site.Language.Lang -}}
 {{- $endDate := "" -}}

layouts/_partials/header.ics

@@ -1,4 +1,4 @@
-{{- if or (eq hugo.Environment "development") (eq hugo.Environment "debug") }}{{ warnidf "debug-partial-used" "Partial used: %s" templates.Current.Name }}{{ end -}}
+{{- if or (eq hugo.Environment "development") (eq hugo.Environment "debug") }}{{ warnf "Partial used: %s" templates.Current.Name }}{{ end -}}
 {{/* Override of component header.ics — uses .Site.Language.Lang instead of .Locale (requires Hugo 0.159+) */}}
 {{ with dict `` `
   ` "name"         (dict "text" "PowerShell.org Community Calendar" "lang" .Site.Language.Lang) `` `

netlify.toml

@@ -0,0 +1,31 @@
+[build]
+  base = "/"
+  command = "hugo --minify"
+  publish = "public"
+
+[build.environment]
+  HUGO_VERSION = "0.155.1"
+  HUGO_ENVIRONMENT = "production"
+  TZ = "UTC"
+
+[[headers]]
+  for = "/*"
+  [headers.values]
+    X-Frame-Options = "DENY"
+    X-Content-Type-Options = "nosniff"
+    Referrer-Policy = "strict-origin-when-cross-origin"
+
+[[headers]]
+  for = "/discord/*"
+  [headers.values]
+    Cache-Control = "public, max-age=3600"
+
+[[headers]]
+  for = "/*.css"
+  [headers.values]
+    Cache-Control = "public, max-age=31536000, immutable"
+
+[[headers]]
+  for = "/*.js"
+  [headers.values]
+    Cache-Control = "public, max-age=31536000, immutable"

package.json

@@ -9,7 +9,7 @@
     "preview": "hugo server --environment production"
   },
   "devDependencies": {
-    "hugo-extended": "^0.121.0",
+    "hugo-extended": "^0.155.1",
     "node-fetch": "^3.3.2"
   }
 }