Simplify README #3201

Job	Run time
lint	48s
mypy (./packages/autogen-core)	2m 5s
mypy (./packages/autogen-magentic-one)	1m 3s
pyright (./packages/autogen-core)	1m 4s
mypy (./packages/agbench)	1m 29s
pyright (./packages/autogen-magentic-one)	1m 37s
mypy (./packages/autogen-ext)	1m 57s
pyright (./packages/agbench)	1m 2s
mypy (./packages/autogen-agentchat)	1m 2s
docs (./packages/autogen-core)	1m 23s
codecov (./packages/autogen-core)	56s
pyright (./packages/autogen-ext)	1m 3s
mypy (./packages/magentic-one-cli)	1m 1s
pyright (./packages/autogen-agentchat)	53s
codecov (./packages/autogen-magentic-one)	1m 45s
pyright (./packages/magentic-one-cli)	54s
codecov (./packages/autogen-ext)	2m 47s
docs-example-check (./packages/autogen-core)	2m 44s
codecov (./packages/autogen-agentchat)	1m 0s
format	46s
samples-code-check	1m 3s
test (./packages/autogen-core)	53s
test (./packages/autogen-magentic-one)	1m 22s
test (./packages/autogen-ext)	2m 43s
test (./packages/autogen-agentchat)	56s
check-proto-changes-python	1m 4s
markdown-code-lint	2m 1s
	37m 21s

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