docs: re-version 0.15.0

[brbrr]

No description provided.

[Copilot]

Pull request overview

Updates the documentation set for the 0.15.0 release, aligning versioned docs/sidebars and operational guides with current configuration flags and supported RPC/WS API versions.

Changes:

• Reformat docs/versions.json and refresh 0.15.0 versioned docs content.
• Update supported JSON-RPC / WebSocket API version listings and examples.
• Add/reflect new tuning + config options and improve Kubernetes deployment instructions.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
docs/versions.json	Reformats the versions list into a multi-line JSON array.
docs/versioned_sidebars/version-0.15.0-sidebars.json	Adjusts the OpenRPC playground sidebar link URL.
docs/versioned_docs/version-0.15.0/websocket.md	Updates supported WS API versions and removes older version examples.
docs/versioned_docs/version-0.15.0/tuning.md	Adds guidance for --db-memtable-count.
docs/versioned_docs/version-0.15.0/staking-validator.md	Minor wording/grammar improvement.
docs/versioned_docs/version-0.15.0/running-juno.md	Updates Rust version prerequisite.
docs/versioned_docs/version-0.15.0/json-rpc.md	Updates supported RPC API versions and removes older version examples.
docs/versioned_docs/version-0.15.0/_config-options.md	Adds db-memtable-count and log-json to the config options table.
docs/docs/running-on-kubernetes.md	Improves Helm install example (testing mode) and quotes PVC label selector.

Comments suppressed due to low confidence (1)

docs/versioned_docs/version-0.15.0/websocket.md:300

• In the v0.10.1 WebSocket example tab, the sample command connects to /ws/v0_9, which contradicts the tab label and the supported-versions list (/ws/v0_10). This will mislead users testing the v0.10 endpoint; update the example URL to use the v0.10 endpoint (and consider double-checking the other tabs for consistency).

<TabItem value="v10" label="v0.10.1">

```bash
# wscat
$ wscat -c ws://localhost:6061/ws/v0_9
    > {"jsonrpc": "2.0", "method": "juno_version", "id": 1}

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[rodrodros]

There were some changes to the docs as well. Please make sure they match with the versioned docs (I think I put a CI a while back to check exactly this)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.42%. Comparing base (2f97425) to head (a538fe3).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3496      +/-   ##
==========================================
+ Coverage   75.40%   75.42%   +0.02%     
==========================================
  Files         385      385              
  Lines       34983    34983              
==========================================
+ Hits        26380    26387       +7     
+ Misses       6745     6742       -3     
+ Partials     1858     1854       -4     

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[brbrr]

@rodrodros, these changes are based on some divergence between docs and versioned docs that the action detected during the 0.15.20 release. I think when I added the k8s docs, I did not update them all equally.