Add privacy-preserving generator meta tag for theme discoverability (#93)

* Initial plan

* Add privacy-preserving generator meta tag for theme discoverability

Co-authored-by: ThomasPe <4225039+ThomasPe@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: ThomasPe <4225039+ThomasPe@users.noreply.github.com>

Author: Copilot

docs/guides/feature-configuration.md

@@ -135,3 +135,31 @@ additional features (e.g., filtering).
 
 -   `trackCategoryTitle`: Name of the category used for the session tracks
     (default: `Track`).
+
+## Theme discoverability
+
+The Event theme includes a **privacy-preserving discoverability marker**: a
+`<meta name="generator" content="hugo-theme-event">` tag in every rendered
+page. This allows maintainers (and anyone else) to discover sites using this
+theme through simple search-engine queries — without any telemetry, cookies,
+tracking IDs, or background requests to remote servers.
+
+### Privacy implications
+
+-   The tag is a static, deterministic string embedded in publicly visible HTML.
+-   No data is ever sent to the theme maintainers or any third party as a result
+    of this tag.
+-   Discovery happens entirely through publicly indexed content; your visitors'
+    privacy is not affected.
+
+### Opting out
+
+If you prefer not to include the discoverability marker, set `disableGenerator`
+to `true` in your theme parameters:
+
+```yaml
+params:
+    themes:
+        event:
+            disableGenerator: true
+```

hugo.yaml

@@ -122,3 +122,7 @@ params:
             # 👇 based on their browser preferences (requires JavaScript).
             # 👇 Set to false to disable (e.g., for demos, testing, or non-JS environments).
             redirectBasedOnBrowserLang: false
+            # 👇 Controls whether a <meta name="generator"> tag is included in rendered HTML.
+            # 👇 This tag allows the theme to be discovered via search-engine queries without
+            # 👇 any telemetry, cookies, or remote beacons. Set to true to opt out.
+            disableGenerator: false

layouts/_default/baseof.html

@@ -68,6 +68,8 @@
 
         <meta name="description" content="{{ .Site.Params.themes.event.description | markdownify | plainify }}" />
 
+        {{ if not .Site.Params.themes.event.disableGenerator }}<meta name="generator" content="hugo-theme-event" />{{ end }}
+
         {{ if .IsTranslated }}
             {{ range .Translations }}
                 <link rel="alternate" hreflang="{{ .Language.Lang }}" href="{{ .Permalink }}" />

tests/baseof.spec.ts

@@ -24,3 +24,10 @@ test('should not render language selector with one language', async ({ page }) =
     const languageSelector = page.locator('[data-testid="language-select"]');
     await expect(languageSelector).toHaveCount(0);
 });
+
+test('Should render generator meta tag by default', async ({ page }) => {
+    await page.goto('/');
+
+    const generator = page.locator('meta[name="generator"][content="hugo-theme-event"]');
+    await expect(generator).toHaveCount(1);
+});