M0: establish EduNumbers course foundation

[pgousdal]

Summary

Establishes the M0 foundation for EduNumbers as a bilingual course on number systems relevant to computing.

Included

• Norwegian primary course structure with parallel English edition
• 25-part curriculum and pedagogical pattern
• introductory chapters on positional systems, binary and hexadecimal
• first exercise set with worked solutions
• shared publication metadata and EPUB styling
• Makefile targets for HTML, EPUB, PDF and Kindle output
• source validation script
• GitHub Actions build workflow and artifact upload
• CC BY 4.0 documentation/course licensing and MIT software licensing

M0 qualification intent

The PR is intended to prove that one source tree can produce the four first-class publication targets and provide the baseline for expanding the complete course in later milestones.