Fix jangly miniLock script inclusion so that the page works on gh-pages (which does not support symlinks)

Modified miniLock.js to support a pathToSourceFiles setting that can be reassigned to accommodate predictable worker script resolution in your own program.
Removed defunct symlink to miniLock `js` folder.
Update HTML references to miniLock scripts.
Fill in the address by default for now...
Need not see expiry label onscreen.