Simplify README #3244

Job	Run time
lint	58s
format	49s
mypy (./packages/autogen-core)	2m 3s
mypy (./packages/autogen-magentic-one)	1m 4s
mypy (./packages/agbench)	52s
codecov (./packages/autogen-core)	1m 9s
mypy (./packages/autogen-ext)	1m 51s
docs (./packages/autogen-core)	1m 25s
codecov (./packages/autogen-magentic-one)	1m 46s
mypy (./packages/autogen-agentchat)	1m 3s
mypy (./packages/magentic-one-cli)	51s
codecov (./packages/autogen-ext)	2m 37s
codecov (./packages/autogen-agentchat)	1m 9s
docs-example-check (./packages/autogen-core)	2m 32s
pyright (./packages/autogen-core)	1m 6s
samples-code-check	1m 3s
pyright (./packages/autogen-magentic-one)	1m 10s
pyright (./packages/agbench)	51s
test (./packages/autogen-core)	52s
pyright (./packages/autogen-ext)	1m 4s
test (./packages/autogen-magentic-one)	1m 26s
pyright (./packages/autogen-agentchat)	53s
test (./packages/autogen-ext)	2m 54s
test (./packages/autogen-agentchat)	55s
pyright (./packages/magentic-one-cli)	52s
check-proto-changes-python	1m 4s
markdown-code-lint	2m 8s
	36m 27s

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