VMAnomaly docs fixes (#2361)

* Added docs for vmanomaly

* Add example images

* Stylistic fixes

* Move images to root

* Update docs/vmanomaly.md

* Update docs/vmanomaly.md

Co-authored-by: Roman Khavronenko <roman@victoriametrics.com>

* Squeeze vmanomaly after vmbackupmanager before Case Studies

Co-authored-by: Aliaksandr Valialkin <valyala@victoriametrics.com>
Co-authored-by: Roman Khavronenko <roman@victoriametrics.com>

docs/Articles.md

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 # Articles

docs/BestPractices.md

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 # VictoriaMetrics best practices

docs/CHANGELOG.md

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 # CHANGELOG

docs/CaseStudies.md

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-sort: 11
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 # Case studies and talks

docs/FAQ.md

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 # FAQ

docs/MetricsQL.md

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 # MetricsQL

docs/PerTenantStatistic.md

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 # VictoriaMetrics Cluster Per Tenant Statistic

docs/Quick-Start.md

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 # Quick Start

docs/Release-Guide.md

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 # Release process guidance

docs/guides/README.md

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 # Guides

docs/operator/README.md

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 # VictoriaMetrics Operator

docs/url-examples.md

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 # VictoriaMetrics API examples

docs/vmanomaly.md

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 # vmanomaly