Remove huawei build

[jarnedemeulemeester]

We will no longer publish Findroid on the Huawei AppGallery store.

The reasons are:

• User base is very small. I don't have exact numbers for active users but the app has less then 200 downloads over the span of 2 years.
• The next version of HarmonyOS will drop support for Android apps.
• People can continue to install Findroid using other methods like Fdroid (soon) or directly downloading the APK from GitHub.
• Less work making a build, writing release notes, publishing to the store.
• No longer need for the specific huawei flavor of Findroid. This was necessary because Huawei disallows the use of the Android robot in the app logo. So a different logo was created. Which meant a separate flavor in the codebase.

Required steps:

• [x] Delete the app from Huewei AppGallery
• [x] Remove badge from README
• [x] Remove huawei flavor

[jarnedemeulemeester]

Request for deletion has been sent to Huawei

[jarnedemeulemeester]

Huawei flavor has been removed from the codebase