Improving Tips in README.md #1396

Currently the tips section in the readme is a bit unclear about the htmldoc generation, suggestion welcome for how to improve it. Especially looking at the Makefile I'm not able to understand precisely what the import-doc target does:

import-doc:
	-git subtree add -P htmldoc release/$(R)
	T=`git subtree split -P htmldoc release/$(R)`;\
	git subtree merge -P htmldoc --squash $$T \
		-m 'importing htmldoc from $(R)'

It would be also helpful to batch-generate org to html, so I suggest adding the following to the Makefile:

ORG_FILES=$(wildcard *.org)
HTML_FILES=$(ORG_FILES:.org=.html)

all: 

org-html: $(HTML_FILES)

%.html: %.org
	emacs --batch $< -e org-html-export-to-html

the all: target is meant to suppress defaulting to import-doc, as it sounds to me that this could have unintended consequences if one runs it by mistake.