Rewrite MC-01a autocorrelations tutorial for accuracy and style

[egull]

Summary

• Fix code-fence languages: ALPS parameter files and shell commands were incorrectly tagged as Python; only actual Python code now uses that tag
• Remove outdated Internet Explorer reference from the XML-viewer command list
• Expand the Cluster updates section: add the full parm1b parameter file, runnable command-line and Python snippets, and a physical explanation of critical slowing down (tau ~ L^z, with z approx 2 vs z approx 0.25 for cluster algorithms)

Changes applied to all three language versions (en, ja, zh-cn).

Replaces the conflicting PR #54, which was closed because mc01a.md and mc01b.md had already been partially updated by PRs #47 and #48. This PR is rebased on current main and only addresses the remaining gaps in mc01a.md.

Test plan

• Code blocks render with correct syntax highlighting (plain for parameter/shell, Python for scripts)
• Cluster updates section shows full runnable parm1b and tutorial1b.py content
• Internet Explorer line is gone from the XML-viewer list
• Math renders correctly

Generated with Claude Code

[egull]

I was a bit too quick – PR54 was off a previous main. Rather than merging the things, I reapplied the changes to the current main. This is what you already reviewed for PR54, plus the Chinese and Japanese translations.

[Ooolab]

Thanks for looking back and solving the conflicts!