Delete styleguide.md

This is in intermediate commit, so the content of `/README.md`can be moved to the styleguid, but the history is kept

website/docs/styleguide.md

@@ -1,30 +0,0 @@
----
-title: Styleguide
-section: styleguide
-search_exclude: true
-menu:
-  - ['Logo', 'logo']
-  - ['Colors', 'colors']
-  - ['Typography', 'typography']
-  - ['Elements', 'elements']
-  - ['Components', 'components']
-  - ['Setup & Installation', 'setup']
-  - ['Markdown Reference', 'markdown']
-  - ['Project Structure', 'structure']
-  - ['Editorial', 'editorial']
-sidebar:
-  - label: Styleguide
-    items:
-      - text: ''
-        url: '/styleguide'
-  - label: Resources
-    items:
-      - text: Website Source
-        url: https://github.com/explosion/spacy/tree/master/website
-      - text: Contributing Guide
-        url: https://github.com/explosion/spaCy/blob/master/CONTRIBUTING.md
----
-
-import Readme from 'README.md'
-
-<Readme />