### Describe Your Changes
docs/vmanomaly: updates for v1.16.3
### Checklist
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- [x] My change adheres [VictoriaMetrics contributing
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### Describe Your Changes
docs/vmanomaly: remove duplicate header in VmWriter docs
### Checklist
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### Describe Your Changes
docs for `vmanomaly`, updated after release 1.16.2
### Checklist
The following checks are **mandatory**:
- [x] My change adheres [VictoriaMetrics contributing
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### Describe Your Changes
release notes for patches 1.15.6 - 9
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### Describe Your Changes
- change links from relative to absolute under Anomaly Detection section
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### Describe Your Changes
* `sort` param is unused by the current website engine, and was present only for compatibility
with previous website engine. It is time to remove it as it makes no effect
* re-structure guides content into folders to simplify assets management
### Checklist
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- [ ] My change adheres [VictoriaMetrics contributing
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### Describe Your Changes
- moved files from root to VictoriaMetrics folder to be able to mount
operator docs and VictoriaMetrics docs independently
- added ability to run website locally
### Checklist
The following checks are **mandatory**:
- [ ] My change adheres [VictoriaMetrics contributing
guidelines](https://docs.victoriametrics.com/contributing/).
