Upper case and lower case file names

[skreutzer]

There are several files in the repository that differ in their name only by upper and lower case. On Unix-based operating systems, they're treated as different, separate files, where the $/en/peeragogy-shell.tex refers the (outdated) upper-case variants, while the new versions from the Peeragogy.github.io repository are named in lower-case. Under Microsoft Windows, on extracting the downloaded .zip, the files are considered to be duplicates, asking the user if to keep the first variant or overwrite it with the second, or rename (then without effect in regard to the peeragogy-shell.tex).

Adjust + expect names according to the Peeragogy.github.io repository as the source, get rid of the other files?

[skreutzer]

The commit 251d7c8 chose the file for the lower-case name that received the most recent changes, even if this technically reverts what has already been in there a newer version synced from the source earlier, while the older one still received more recent changes, under the assumption that the only remaining file with lower-case name will get updated from the source again (by overwrite because of the same file name and character case of the Markdown source). Files with upper-case names that don't have a lower-case equivalent weren't moved even if they obviously got renamed in the source to reflect that they're patterns, which can be the next step for this issue.

[skreutzer]

• $/en/use_or_make.tex is also checked into source and will recreate it on update/sync, pull request there for its deletion
• $/en/specific_project.tex got overwritten by $/en/a_specific_project.tex, which then got renamed to $/en/pattern-specific.tex
• From source, osl.md is missing (referenced, just not checked in)
• From source, pattern_audit.md is missing (not referenced)
• From source, practice.md is missing (reference commented out)
• From source, preface.md is missing (not referenced)
• From source, social-bookmarking.md is missing (not referenced)
• From source, workbook.md is missing (referenced, just not checked in)
• Extra files in source like ALL.md and README.md ignored
• No files removed yet which aren't referenced in $/en/peeragogy-shell.tex that also don't get updated from source