[tracker] website: Document .nomedia trick

[Sam Thursfield <sthursfield src gnome org>]

commit a0ba5a635a33b07d090d7e76b75f2c585bc2032e
Author: Sam Thursfield <sam afuera me uk>
Date:   Thu Apr 30 23:24:06 2020 +0200

    website: Document .nomedia trick

 docs/website/faq.md | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/docs/website/faq.md b/docs/website/faq.md
index 6d1b96abe..2da090c6d 100644
--- a/docs/website/faq.md
+++ b/docs/website/faq.md
@@ -30,6 +30,13 @@ tool.
 The relevant schemas are `org.freedesktop.Tracker.Miner.Files` and
 `org.freedesktop.Tracker.Extract`.
 
+To tell Tracker's indexer to ignore a directory and all its contents, you can
+create an empty file named `.nomedia` inside the directory. This trick also
+works [on Android](https://www.lifewire.com/nomedia-file-4172882) devices.
+Files named `.trackerignore`, `.git` and `.hg` have the same effect. You can
+configure this behaviour with the org.freedesktop.Tracker.Miner.Files
+`ignored-directories-with-content` GSettings key.
+
 ## Why does Tracker consume resources on my PC?
 
 When you add or edit files, Tracker will update its index. This should be very