docs: Shove stuff into the docs directory

WARNING: There is a GitHub repo in there: https://github.com/sona-tau/dfs-docs

Doxyfile

···
 # entered, it will be relative to the location where Doxygen was started. If
 # left blank the current directory will be used.
 
-OUTPUT_DIRECTORY       = .build
+OUTPUT_DIRECTORY       = docs
 
 # If the CREATE_SUBDIRS tag is set to YES then Doxygen will create up to 4096
 # sub-directories (in 2 levels) under the output directory of each output format
···
 # The default directory is: html.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
-HTML_OUTPUT            = html
+HTML_OUTPUT            = .
 
 # The HTML_FILE_EXTENSION tag can be used to specify the file extension for each
 # generated HTML page (for example: .htm, .php, .asp).
···
 # If the GENERATE_LATEX tag is set to YES, Doxygen will generate LaTeX output.
 # The default value is: YES.
 
-GENERATE_LATEX         = YES
+GENERATE_LATEX         = NO
 
 # The LATEX_OUTPUT tag is used to specify where the LaTeX docs will be put. If a
 # relative path is entered the value of OUTPUT_DIRECTORY will be put in front of

Makefile

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 clean:
 	rm -rf $(BUILD)
 
-docs: $(BUILD)
+docs:
+	mkdir -p docs
 	doxygen Doxyfile
 
 .PHONY: all clean