Clarify HDD storage modes and Ember paths

[NathanNeurotic]

Summary

Rewrites the README and quickboot template around the actual question users need to answer: where is Ember stored?

README

• makes it explicit that __.EMBER is an example, not a required partition;
• explains why a dedicated partition may still be convenient for space/organization;
• distinguishes USB HDD/SSD (mass?:), internal exFAT / APA-Jail exFAT (ata:), and APA/PFS (hdd0:<PARTITION>:pfs:);
• explains that Ember may live in an existing suitable PFS partition such as __common;
• separates where launcHER lives from where Ember lives;
• moves APA/PFS handoff details behind the basic storage-choice explanation;
• adds clearer quick-start, storage profile, and troubleshooting sections.

examples/launcHER.CNF

• adds an HDD decision guide at the top;
• explicitly states that a dedicated __.EMBER partition is not required;
• documents USB HDD/SSD as USB mass storage;
• documents internal exFAT / APA-Jail exFAT as ata:;
• documents APA/PFS as using whichever PFS partition actually contains Ember;
• keeps the required pfs0: / -skip_argv0 / -dev9=NICHDD handoff for PFS launches.

Both documentation files are changed together in a single commit.

[coderabbitai]

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