remove mobile app banner (#2222) #5253

Job	Run time
Build application and assets	4m 43s
Build Docker image	5m 41s
file_changes	5s
Linting / JavaScript	32s
Linting / CSS	26s
Linting / TypeScript	37s
Linting / Elixir	0s
Unit tests / JavaScript / Mocha	36s
Unit tests / JavaScript & TypeScript / Jest	2m 7s
Type checks / Elixir	3m 22s
Formatting / Elixir	2m 47s
Formatting / JavaScript & TypeScript	29s
Type checks / TypeScript	33s
Unit tests / Elixir / mix coveralls.html	1m 0s
	22m 58s

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