docs:opkg: clean up RST

[amstewart]

Summary

• Fixup minor RST layout issues.
• Use inline literal markup for inline code and applications, rather than bold.
• Refer to IPKs and DEBs, instead of .ipks and .debs in most places.
• Reflow prose to line-break on sentence ends, for easier diffing.
• Minor content changes for clarity.

Testing

• Ran make html locally and manually validated that the opkg tutorials look better and the links work.

[amstewart]

Patch V2

• Address review feedback.

[Copilot]

Pull Request Overview

This PR cleans up and improves the RST documentation for opkg tutorials by addressing minor formatting issues and improving readability. The changes focus on:

• Replacing bold formatting with inline literal markup for code elements and applications
• Changing references from ".ipks" and ".debs" to "IPKs" and "DEBs" for consistency
• Reflowing prose to break on sentence boundaries for better diff readability
• Minor content clarifications and link reference improvements

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 7 comments.

File	Description
docs/source/opkg/opkg_intro.rst	Updates formatting, terminology, and prose flow for the basic opkg tutorial
docs/source/opkg/dkms_opkg.rst	Applies similar formatting and terminology improvements to the DKMS-based kernel module tutorial

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[amstewart]

Patch v2

• Addressed copilot feedback.
• Removed tarballs from source control and build them from the Makefile.
• Replace Charlie Johnston's email in the example opkg IPKs with the RTOS team email.

[jpautler]

When I build and preview the HTML content locally, I see a lot of lines wrapping with syllable-boundary hyphenation. Wrapping on word boundaries seems more readable. Was this intentional or just an unintended side effect?

[jpautler]

When I extract the new locally built dkms_opkg.tar.gz archive, I noticed that it lost the containing dkms_opkg directory upon extraction. Instead it extracts the hello and module_src directories directly into the current directory. This is different than opkg_intro.tar.gz and different than the old dkms_opkg.tar.gz. Perhaps unintended?