convert A. Numbers, bits and bit operations to Markdown (#81)

* apply automatic conversion to A. Numbers

Commands applied:

git mv edmake.htm edmake-old.htm
pandoc --from=html --to=markdown-fenced_divs-bracketed_spans-escaped_line_breaks-smart --wrap=none -o edmake.md edmake-old.htm
sed -i -E 's,^\s+$,,' edmake.md
sed -i -E 's,<span class="dfn">([^<]+)</span>,<dfn>\1</dfn>,g' edmake.md
sed -i -E 's,^(##+) [A-G]\.[0-9.]+,\1,g' edmake.md
sed -i -E 's,\{target="_blank"\},,g' edmake.md

* manual cleanup of A. Numbers

- add to SUMMARY.md
- replace table of contents with <!-- toc -->
- fix spelling of all right
- em dash
- indexes to <sub>
- introduce binary prefixes
- reintroduce original HTML for 12 tables and autonumber them
- convert 4 equations and autonumber them
- HTTPS for uiowa.edu and rfc-editor.org

* fix multiplication table numbering

content/SUMMARY.md

@@ -38,7 +38,7 @@
 
 ---
 
-[Appendix A - Numbers, bits and bit operations]()
+[Appendix A - Numbers, bits and bit operations](./numbers.md)
 [Appendix B - Fixed-point math & LUTs]()
 [Appendix C - Vector and matrix math]()
 [Appendix D - More on makefiles and compiler options](./makefile.md)