Prepare release of 0.8.0 alpha.5

Usage related changes

Closes #407
integrated-devnet defaults to starknet-devnet 0.6.3
Parts of documentation are improved and simplified (especially Cairo 0 compilation).

Updates internal tools:
- cairo compiler to 2.2.0
- scarb to 0.7.0
- starknet-devnet to 0.6.3

[x] Formatted the code
[x] No linter errors + tried to avoid introducing linter warnings
[x] Performed a self-review of the code
[x] Rebased to the last commit of the target branch (or merged it into my branch)
[x] Documented the changes
[x] Updated the test directory (with a test case consisting of network.json, hardhat.config.ts, check.ts)
[x] Linked issues which this PR resolves
[x] Created a PR to the plugin branch of starknet-hardhat-example:
- https://github.com/0xSpaceShard/starknet-hardhat-example/pull/126
- [x] Modified test.sh to use my example repo branch
- [x] Restored test.sh to to use the original branch (after the example repo PR has been merged)
[x] All tests are passing (for external contributors who don't have access to the CI/CD pipeline)