Remove README files that have been since been migrated to the reference documentation. Also updated remaining markdown files to asciidoctor to save having a mix of different formats. Fixed gh-503  | 
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| README.adoc | ||
| howto.md | ||
		
			
				
				README.adoc
			
		
		
			
			
		
	
	= NOTE Documentation can now be found in the `spring-boot-docs` project. This folder will be removed at a future date.