new doc format (incomplete)

git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@873 212acab6-be3b-0410-9dea-997c60f758d6

Docs/src/build.bat

@@ -0,0 +1,8 @@
+bin\halibut.exe config.but intro.but usage.but script.but attributes.but compilerflags.but history.but license.but
+@del *.hlp
+@del *.cnt
+@copy Contents.html index.html
+@copy index.html IndexPage.html
+@del output.txt
+@copy *.html ..\\
+@del -f *.html