Reorganize files to follow table of contents

[twsouthwick]

This mostly just moves files around to fit with what the ToC is. The only visible change is that the How-To/Working With sections are conceptually similar and have been combined under the package types. This makes it more discoverable to a user wanting to know how to do something with Word/PowerPoint/Excel. Subsequent changes will reduce the overlap between the files

[learn-build-service-prod]

Learn Build status updates of commit f9fe924:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/about-the-open-xml-sdk.md	✅Succeeded
docs/general/how-to-add-a-new-document-part-that-receives-a-relationship-id-to-a-package.md	✅Succeeded
docs/general/how-to-add-a-new-document-part-to-a-package.md	✅Succeeded
docs/general/how-to-copy-the-contents-of-an-open-xml-package-part-to-a-document-part-in-a-dif.md	✅Succeeded
docs/general/how-to-create-a-package.md	✅Succeeded
docs/general/how-to-get-the-contents-of-a-document-part-from-a-package.md	✅Succeeded
docs/general/how-to-remove-a-document-part-from-a-package.md	✅Succeeded
docs/general/how-to-replace-the-theme-part-in-a-word-processing-document.md	✅Succeeded
docs/general/how-to-search-and-replace-text-in-a-document-part.md	✅Succeeded
docs/general/introduction-to-markup-compatibility.md	✅Succeeded
docs/general/overview.md	✅Succeeded
docs/how-do-i.md	✅Succeeded	n/a (file deleted or renamed)
docs/how-to-accept-all-revisions-in-a-word-processing-document.md	✅Succeeded	n/a (file deleted or renamed)
docs/how-to-add-a-comment-to-a-slide-in-a-presentation.md	✅Succeeded	n/a (file deleted or renamed)
docs/how-to-add-a-new-document-part-that-receives-a-relationship-id-to-a-package.md	✅Succeeded	n/a (file deleted or renamed)
docs/how-to-add-a-new-document-part-to-a-package.md	✅Succeeded	n/a (file deleted or renamed)
docs/how-to-add-custom-ui-to-a-spreadsheet-document.md	✅Succeeded	n/a (file deleted or renamed)
docs/how-to-add-tables-to-word-processing-documents.md	✅Succeeded	n/a (file deleted or renamed)
docs/how-to-apply-a-style-to-a-paragraph-in-a-word-processing-document.md	✅Succeeded	n/a (file deleted or renamed)
docs/how-to-apply-a-theme-to-a-presentation.md	✅Succeeded	n/a (file deleted or renamed)
docs/how-to-calculate-the-sum-of-a-range-of-cells-in-a-spreadsheet-document.md	✅Succeeded	n/a (file deleted or renamed)
docs/how-to-change-text-in-a-table-in-a-word-processing-document.md	✅Succeeded	n/a (file deleted or renamed)
docs/how-to-change-the-fill-color-of-a-shape-in-a-presentation.md	✅Succeeded	n/a (file deleted or renamed)
docs/how-to-change-the-print-orientation-of-a-word-processing-document.md	✅Succeeded	n/a (file deleted or renamed)
docs/how-to-convert-a-word-processing-document-from-the-docm-to-the-docx-file-format.md	✅Succeeded	n/a (file deleted or renamed)

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[twsouthwick]

/cc @mikeebowen