Update docs and CI retention (#124)

- Set artifact retention to 30 days
- Update script dscription
- Updated docs

Documentation/app-lifecycle.md

@@ -1,12 +0,0 @@
-# Application Lifecycle
-
-The app goes through these states:
-
-![app lifecycle state diagram](pics/app-lifecycle.png)
-
-Let's look at a scenario where an app launches another app:
-
-1. `first` app starts: `first.onStart()` -> `first.onShow()`
-2. `second` app starts: `first.onHide()` -> `second.onStart()` -> `second.onShow()`
-3. `second` app stops: `second.onHide()` -> `second.onStop()` -> `first.onShow()`
-4. `first` app stops: `first.onHide()` -> `first.onStop()`

Documentation/external-apps.md

@@ -1,18 +0,0 @@
-# External Apps
-
-## Building
-
-Steps to build:
-
-- Build the main project with `idf.py build` in the root folder of the project
-- Open a terminal at `ExternalApps/${AppName}`
-- The first time, run `./build.sh` (during consecutive runs, you can run `idf.py build`)
-- Find the executable `build/${AppName}.app.elf` and copy it to an SD card.
-
-## Developing apps
-
-Currently, only C is supported. The `TactilityC` project converts Tactility's C++ code into C.
-
-Methods need to be manually exposed to the ELF apps, by editing `TactilityC/Source/TactilityC.cpp`
-
-You can put apps in `Data/config` or `Data/assets` during development, because putting it on an SD card takes more effort.