docs: Added starter dev notes on push to hugging face hub

[nabinchha]

Adds a dev note post to cover push_to_hub feature of Data Designer

[greptile-apps]

Greptile Summary

This PR adds a new developer notes blog post documenting the push_to_hub feature of Data Designer, along with four supporting images and the corresponding nav entry in mkdocs.yml. The post covers the full push_to_hub API surface — two entry points (results.push_to_hub() and HuggingFaceHubClient.push_to_hub_from_folder()), the upload pipeline order, processor-to-HF-config mapping, auto-generated dataset card generation, auth token resolution, and the reproducibility round-trip via builder_config.json.

Key observations:

• Previously noted issues have been addressed: the <!-- more --> excerpt marker is now correctly placed after the two-line intro (line 14) with no redundant occurrences, and the dataset card template path at line 229 is the full, correct path (packages/data-designer/src/data_designer/integrations/huggingface/dataset_card_template.md), confirmed against the repository file system.
• The code example on line 23 uses data_designer as a variable name for a DataDesigner instance, which shares the name of the imported package — a minor readability concern for developers following along.
• The mkdocs.yml nav entry follows the same explicit-listing pattern used by all other dev notes posts, so there is no structural inconsistency.

Confidence Score: 4/5

• Documentation-only PR with accurate content; safe to merge with a minor style fix in the code example.
• All changes are documentation (markdown, images, YAML nav entry). Previously flagged issues with excerpt markers and template path are resolved. The only remaining note is a minor variable naming style concern in the code snippet that doesn't affect correctness.
• docs/devnotes/posts/push-datasets-to-hugging-face-hub.md — minor variable naming style in the opening code example.

Important Files Changed

Filename	Overview
docs/devnotes/posts/push-datasets-to-hugging-face-hub.md	New dev note covering push_to_hub feature; placement and dataset card template path are now correct; minor code example style inconsistency noted.
docs/devnotes/.authors.yml	Added nmulepati author entry; format is consistent with existing entries.
mkdocs.yml	New post added to nav; consistent with the pattern used for all other dev notes posts.
docs/devnotes/posts/images/push-to-hub-hero.png	New hero image for the blog post; referenced correctly relative to the post's location.

Sequence Diagram

sequenceDiagram
    participant User
    participant DataDesigner
    participant HuggingFaceHubClient
    participant HuggingFaceHub

    User->>DataDesigner: create(config_builder, num_records)
    DataDesigner-->>User: results

    User->>HuggingFaceHubClient: results.push_to_hub(repo_id, description, tags)
    HuggingFaceHubClient->>HuggingFaceHub: Upload README.md (dataset card)
    HuggingFaceHubClient->>HuggingFaceHub: Upload data/*.parquet (remapped from parquet-files/)
    HuggingFaceHubClient->>HuggingFaceHub: Upload images/* (if image columns exist)
    HuggingFaceHubClient->>HuggingFaceHub: Upload {processor}/* (remapped from processors-files/)
    HuggingFaceHubClient->>HuggingFaceHub: Upload builder_config.json
    HuggingFaceHubClient->>HuggingFaceHub: Upload metadata.json (paths rewritten)
    HuggingFaceHubClient-->>User: dataset URL

    User->>DataDesigner: DataDesignerConfigBuilder.from_config(HF_blob_URL)
    DataDesigner->>HuggingFaceHub: Fetch builder_config.json (blob → raw URL rewrite)
    HuggingFaceHub-->>DataDesigner: builder_config.json
    DataDesigner-->>User: config_builder (fully hydrated)

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_{Last reviewed commit: a923a2a}

[dhruvnathawani]

Did you use AI for the images?
LGTM

[nabinchha]

Did you use AI for the images? LGTM

@dhruvnathawani, yes!