[#1] Add Akvopedia URIs support

* Update host and protocol (HTTP)
* Use 'wiki' path for API requests
* Update 'wikis.json' file
[#2] Update Akvopedia resources

* Rename app
* Add akvopedia icon (tmp)
* Change package name
[#2] Update ContentProvider authority and paths

* Use akvopedia specific URIs
Merge branch 'akvopedia'
[#3] Point to our own MobileFrontend submodule