Bug 1040091 - [v2.1] Fix imei issue in test_settings_device_info.py
Bug 1040070 - [Verical Homescreen] Use smaller images sizes for low capability devices r=crdlc

The following changes are made for low capability devices:

* Icons default to 4 per row.
* Icon resolution is reduced.
* Icon rendering does not account for devicePixelRatio.
bug 1038167 - Update icons for Find My Device, Vertical Homescreen, Smart Collection and System App
Merge pull request #21834 from KevinGrandon/bug_1029902_low_memory_features

Bug 1029902 - [Vertical Homescreen] Implement device capability configuration
Merge pull request #21874 from chirarobert/fix_imei_test

Bug 1040091 - [v2.1] Fix imei issue in test_settings_device_info.py
Bug 1038103 - Generate documentation from source code and publish to readthedocs.org. r=wlachance r=zcampbell
Merge pull request #21913 from nullaus/bug1038167

bug 1038167 - Update icons for Find My Device, Vertical Homescreen, Smar...