[eog] help: Remove Picasa plugin documentation

[Andre Klapper <aklapper src gnome org>]

commit 3fb952fd60f67977f48d4103561c7a7fa0844c61
Author: Andre Klapper <a9016009 gmx de>
Date:   Sun Feb 28 16:12:40 2021 +0100

    help: Remove Picasa plugin documentation
    
    Fixes #181

 help/C/plugin-picasa.page | 36 ------------------------------------
 help/C/plugins.page       |  3 ---
 help/meson.build          |  1 -
 3 files changed, 40 deletions(-)
---
diff --git a/help/C/plugins.page b/help/C/plugins.page
index 2fa8dab7..43590014 100644
--- a/help/C/plugins.page
+++ b/help/C/plugins.page
@@ -57,9 +57,6 @@ background in fullscreen mode.</p>
   <p><link xref="plugin-exif-digital#map">Map</link>: Display the 
   geolocation of a digital photo on a map.</p>
  </item>
- <item>
-  <p><link xref="plugin-picasa">PicasaWeb Uploader</link>: Upload your pictures to PicasaWeb.</p>
- </item>
  <item>
   <p><link xref="plugin-python-console">Python Console</link>:
 A Python scripting console for the image viewer.</p>
diff --git a/help/meson.build b/help/meson.build
index 36d3e110..bd278cde 100644
--- a/help/meson.build
+++ b/help/meson.build
@@ -19,7 +19,6 @@ sources = [
   'plugin-exif-digital.page',
   'plugin-fullscreen-background.page',
   'plugin-fullscreen-double-click.page',
-  'plugin-picasa.page',
   'plugin-python-console.page',
   'plugin-send-by-mail.page',
   'plugin-slideshow-shuffle.page',