Add Spring Boot course, check_urls=free-courses-hi.md (#5166)
* Add Spring Boot course, check_urls=free-courses-hi.md
* merge spring into Java
prefer not to create single item subcategories (also, isn't Spring Boot a subcategory of Spring? I haven't done Java or Spring for a while!)
Co-authored-by: NEric Hellman <eric@hellman.net>
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