feat userver: release 2.15

Tests: протестировано CI
commit_hash:966bfb7f48e65d34cd416c4c0caa527c518b99b9

feat docs: Release 2.14

Tests: на прод не влияет
commit_hash:5a4b19a2191b5f4676cc4231df484582249a0387

feat docs: Release 2.13

Tests: протестировано CI
commit_hash:bf6ef092a6b0e517485efa54cfebca15283d6de2

feat docs: release 2.12

Tests: протестировано CI
commit_hash:19e4dbcb836c8d0241a42da8ffa41a2688d69c65

feat docs: release 2.11

Tests: протестировано CI
commit_hash:c46400592526db418aa30e9f6019e49a7a81c528

feat docs: release 2.10

Tests: протестировано CI, на прод не влияет
commit_hash:3cfcc5d4f364ec40739ed0bf21db8704239389f8

feat docs: release 2.9

Tests: протестировано CI
commit_hash:77c0bd46ab04e137f803e6ba2676461a934d70f5

feat docs: release 2.8

Tests: протестировано CI
commit_hash:cad3714552a87154493216ccfcf3b9c2286baa8e

feat docs: Release 2.7

Tests: протестировано CI
commit_hash:4153476c2a05995c5afc003e5657c2b6819c6776

feat docs: release 2.6

Tests: протестировано CI
commit_hash:1eb47626f57ccf2624cf092b89df9f97764f0e60