[pitivi] help: use gnome.yelp helper in help meson file

[Thibault Saunier <tsaunier src gnome org>]

commit e6a9f5144764514c9fa76f1cb1d5ef2e93463895
Author: Claude Paroz <claude 2xlibre net>
Date:   Mon Mar 12 14:20:41 2018 +0100

    help: use gnome.yelp helper in help meson file
    
    Fixes #2172

 help/C/meson.build  |  7 -------
 help/LINGUAS        |  9 +++++++++
 help/ca/meson.build | 19 -------------------
 help/cs/meson.build | 19 -------------------
 help/de/meson.build | 19 -------------------
 help/el/meson.build | 18 ------------------
 help/es/meson.build | 18 ------------------
 help/fr/meson.build | 18 ------------------
 help/meson.build    | 37 ++++++++++++++++++++++++++-----------
 help/sl/meson.build | 18 ------------------
 help/sv/meson.build | 18 ------------------
 help/uk/meson.build | 18 ------------------
 12 files changed, 35 insertions(+), 183 deletions(-)
---
diff --git a/help/LINGUAS b/help/LINGUAS
new file mode 100644
index 00000000..90a3c208
--- /dev/null
+++ b/help/LINGUAS
@@ -0,0 +1,9 @@
+ca
+cs
+de
+el
+es
+fr
+sl
+sv
+uk
diff --git a/help/meson.build b/help/meson.build
index 7b43d2f7..9c19fdbb 100644
--- a/help/meson.build
+++ b/help/meson.build
@@ -1,4 +1,6 @@
-help_pages = [
+gnome = import('gnome')
+
+sources = [
     'about.page',
     'cheatsheet.page',
     'codecscontainers.page',
@@ -27,13 +29,26 @@ help_pages = [
     'workwithprojects.page'
 ]
 
-subdir('C')
-subdir('ca')
-subdir('cs')
-subdir('de')
-subdir('el')
-subdir('es')
-subdir('fr')
-subdir('sl')
-subdir('sv')
-subdir('uk')
+media = [
+  'figures/codecscontainers.jpg',
+  'figures/fadestep1.png',
+  'figures/fadestep2.png',
+  'figures/fadestep3.png',
+  'figures/keyframecurves.png',
+  'figures/layers.png',
+  'figures/logo.png',
+  'figures/mainwindow.jpg',
+  'figures/ripple-after.png',
+  'figures/ripple-before.png',
+  'figures/roll-after.png',
+  'figures/roll-before.png',
+  'figures/ruler.png',
+  'figures/trimming-individual.png'
+]
+
+gnome.yelp(
+  meson.project_name(),
+  sources: sources,
+  media: media,
+  symlink_media: true
+)