server/README.md: move documentation of unimplemented routes #978

Job	Run time
sdk-test (3.9)	34s
sdk-test (3.12)	34s
check-python-versions	7s
sdk-static-analysis	30s
sdk-readme-codeblocks	24s
sdk-package	19s
sdk-docs	22s
repository-check-copyright	16s
compliance-tool-test (3.12)	42s
compliance-tool-test (3.9)	36s
compliance-tool-package	16s
compliance-tool-static-analysis	29s
server-package	56s
server-static-analysis	29s
	6m 34s

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