front-end: Introduce 'front-end' directory with source files for building the front-end The top level with package.json is not included when installing with pip, and 'kallithea-cli front-end-build' and npm would thus fail. Instead, introduce 'kallithea/front-end/'. It is under 'kallithea/' and is thus included when doing pip install, but it is just a source directory and not under "public". Most of the "less" stuff should probably move there. And probably also most things that now are checked in under "public", so a fully populated public front-end directory can be built anywhere, without write access to the Python installation directory.

--- a/.hgignore	Sun Dec 23 21:16:07 2018 +0100
+++ b/.hgignore	Tue Dec 04 12:16:20 2018 +0100
@@ -8,7 +8,6 @@
 *.mo
 .eggs/
 tarballcache/
-node_modules/
 
 syntax: regexp
 ^rcextensions
@@ -22,6 +21,8 @@
 ^\.project$
 ^\.pydevproject$
 ^\.coverage$
+^kallithea/front-end/node_modules$
+^kallithea/front-end/package-lock\.json$
 ^kallithea/public/css/style\.css(\.map)?$
 ^kallithea/public/css/pygments.css$
 ^theme\.less$