Mambo

- added page meta 'publish', by default True. If False it will skip the page
- Added cache busting, + options. config: build.cache_busting
- extensions list
- ignore list
- Added _root under /static, to copy its content to the root directory

- Added context site.__env__ and site.__generator__

- Added context page.collections
- Added collection
- Added content folder
- Added Timezone
- Added sitemap
- %%COLLECTION_CONTENT%%
- block __PAGE_CONTENT__

- fixed "build" that was failing due to compress_html (now removed in favor of htmlmin)
- removed "extras" folder.
- use htmlmin to minify html
- move kolibri.extras.md to kolibri.md
- No more global macros, macros moved to templates/macros/meta.html
- remove unecessary objects

- Added In Single File Component %%STATIC_URL%% replacement so it can be added To
replace the full path

- remove macro.script_tag, macro.stylesheet_tag,
- remove blocks: __PAGE_COMPONENT_STYLE__, __PAGE_COMPONENT_SCRIPT__
- added function {{ script_tag }} {{ stylesheet_tag }}
- added context page.assets.scripts, page.ssets.stylesheets,
containing the list of respective properties. To be included in page with {{ script_tag }}
- Update skel templates