[merge] pull request #2 from kj-sh604/feat/use-dash-st-rewrite

# feat: use `feat/same-template-concat` branch `-st` implementation as main `kjandoc` binary

this pull request updates the project to improve the quality and fidelity of merged `.pptx` files, and simplifies dependencies. 

the most significant changes are a rewrite of the merging approach to preserve editability and formatting, and the removal of several python dependencies that are no longer needed (as seen in the `feat/same-template-concat` that I still have up)

## enhancements to merging functionality:

* the merging process now operates directly on the ooxml/zip structure of `.pptx` files, preserving full editability and achieving near-complete fidelity to the original formatting. slide masters, layouts, themes, notes, and embedded media are all copied, and duplicate media files are deduplicated. 

* a final libreoffice normalization step is used to clean up structural issues.

## dependency updates:

* removed unnecessary dependencies from `src/requirements.txt`, including `pillow`, `python-pptx`, `typing_extensions`, and `xlsxwriter`, leaving only `lxml` as a required python package.

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