Update HIP target handling using alias

[vlad-perevezentsev]

This PR suggests simplifying DPCTL_TARGET_HIP handling by using target aliases amd_gpu_<arch> and removing support for amdgcn-amd-amdhsa target.
Also updates docs to clarify how to determine and use the correct AMD GPU architecture.

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[github-actions]

Deleted rendered PR docs from intelpython.github.com/dpctl, latest should be updated shortly. 🤞

[github-actions]

Array API standard conformance tests for dpctl=0.21.0dev0=py310h93fe807_22 ran successfully.
Passed: 1116
Failed: 5
Skipped: 119

[ndgrigorian]

This LGTM overall

After this and the CUDA architecture update are merged, I think allowing setting CUDA and HIP architecture as arguments to scripts/build_locally.py script would be convenient

The base branch was changed.

[github-actions]

Array API standard conformance tests for dpctl=0.21.0dev0=py310h93fe807_41 ran successfully.
Passed: 1115
Failed: 6
Skipped: 119

[coveralls]

coverage: 84.995% (+0.01%) from 84.984%
when pulling a8b9a1f on update_amd_build
into 84a90dc on master.

[github-actions]

Array API standard conformance tests for dpctl=0.21.0dev0=py310h93fe807_42 ran successfully.
Passed: 1116
Failed: 5
Skipped: 119

[github-actions]

Array API standard conformance tests for dpctl=0.21.0dev0=py310h93fe807_45 ran successfully.
Passed: 1114
Failed: 7
Skipped: 119