Doc: remove useless info from docs.rs front page #2799

Job	Run time
openraft-test-bench (nightly)	54s
cluster-benchmark (cluster_benchmark)	45s
examples (stable, raft-kv-memstore)	2m 18s
external-stores (stores/rocksstore-v2)	5m 56s
examples (stable, raft-kv-rocksdb)	8m 0s
examples (nightly, raft-kv-memstore)	2m 8s
lint	6m 46s
examples (nightly, raft-kv-rocksdb)	12m 22s
openraft-feature-test (nightly)	51s
openraft-feature-test (nightly, serde)	53s
openraft-test (stable, 0)	3m 0s
openraft-feature-test (nightly, single-term-leader)	48s
openraft-test (nightly, 30)	3m 11s
openraft-feature-test (nightly, single-term-leader,serde,singlethreaded)	49s
openraft-test (nightly, 0, single-term-leader)	3m 4s
stores (memstore)	45s
Build (nightly, bench,serde,bt,singlethreaded)	48s
stores (rocksstore)	6m 9s
stores (rocksstore-compat07)	6m 47s
tests-feature-test (nightly)	2m 44s
stores (sledstore)	56s
tests-feature-test (nightly, single-term-leader)	2m 42s
tests-feature-test (nightly, loosen-follower-log-revert)	2m 45s
	1h 15m 21s

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