Correct incorrect references to `mifos_lg-logo.png`.
The PNG asset does not exist; the correct file is `mifos_lg-logo.jpg`.
Although the UI rendered correctly due to fallback logic, the incorrect
reference was misleading and could cause issues in future refactors.
Migrate upgrade stylelint from version 10 to 16 and fix all the
stylelint and prettier issues in scss files.
The following deprecated stylistic rules are no longer supported in
stylelint, and the checks are taken over by prettier:
- string-quotes
- max-empty-lines
- max-line-length
