[Tech Debt] Remove temporary installation from the doc

[Sxnan]

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Description

We should update our existing doc to remove below statements after the wheel is release in PYPI.

https://nightlies.apache.org/flink/flink-agents-docs-release-0.2/docs/get-started/installation/#from-official-release

Temporary (v0.2.0): Due to PyPI wheel size limitations, the flink-agents version 0.2.0 is currently not available directly from PyPI. Please download the wheel file manually and install from local:

Download [flink-agents 0.2.0 wheel](https://www.apache.org/dyn/closer.lua/flink/flink-agents-0.2.0/python/flink_agents-0.2.0-py3-none-any.whl)

Install from local wheel:

Are you willing to submit a PR?

• I'm willing to submit a PR!