fix: dataflow.yml in llm.md, Link to the requirement_llm.txt, and typo on yolov8.md

[sauhardh]

Solves #58

Changes and Improvements

on yolov8.md

• .yaml -> .yml and then the link finally works.
• dataflow.yaml to dataflow.yml because later in command line, it is being run using dora start dataflow.yml --attach

on llm.md

• Added link to the requirement_llm.txt

• Added Optimization for lower resource (Optional) section

• Changes on keyboard nodes (This way, it solves the error it threw earlier.)
  (And, i suppose, it can't be operator as Node() is initialized on keyboard_op.py)

  ## Speech to text
  - id: keyboard
    custom:
      source: !Local
      path: keyboard_op.py
      outputs:
        - buffer
        - submitted
        - record
        - ask
        - send
        - change
      inputs:
        recording: whisper/text

[Copilot]

Pull request overview

Updates the YOLOv8 getting-started guide so the referenced dataflow file link resolves correctly and matches the filename used in the run command.

Changes:

• Fixes the wget URL to download dataflow.yml (instead of the non-existent dataflow.yaml) for dora v0.3.6.
• Renames the inline filename label from dataflow.yaml to dataflow.yml to align with dora start dataflow.yml --attach.

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