Fix link to image about PWA app icon install.

Thanks to stevenroose and xet7 !

Fixes #5824

docs/Features/PWA.md

@@ -1,4 +1,4 @@
-[Browser compatibility matrix](Browser-compatibility-matrix)
+[Browser compatibility matrix](../Browser/Browser-compatibility-matrix)
 
 ## Install your Wekan server as an app
 
@@ -15,7 +15,7 @@
 
 3. From Edge menu, install site as app, by clicking top right `⋮` and this menu, that can be used to install and manage/remove apps:
 
-<img src="https://wekan.fi/chromium-edge-install-pwa.png" width="60%" alt="Wekan logo" />
+<img src="chromium-edge-install-pwa.png" width="60%" alt="Install PWA at Chromium Edge" />
 
 4. In next popup, give name to app, like `YourCompany Wekan`, and click `Add`