[WIP] Setting up Hexo for docs

.gitmodules

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+[submodule "docs/themes/hexo-theme-cactus"]
+	path = docs/themes/hexo-theme-cactus
+	url = https://github.com/probberechts/hexo-theme-cactus

docs/.gitignore

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+.DS_Store
+Thumbs.db
+db.json
+*.log
+node_modules/
+public/
+.deploy*/

docs/_config.yml

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+# Hexo Configuration
+## Docs: https://hexo.io/docs/configuration.html
+## Source: https://github.com/hexojs/hexo/
+
+# Site
+title: Hexo
+subtitle:
+description:
+keywords:
+author: John Doe
+language:
+timezone:
+
+# URL
+## If your site is put in a subdirectory, set url as 'http://yoursite.com/child' and root as '/child/'
+url: http://yoursite.com
+root: /
+permalink: :year/:month/:day/:title/
+permalink_defaults:
+
+# Directory
+source_dir: source
+public_dir: public
+tag_dir: tags
+archive_dir: archives
+category_dir: categories
+code_dir: downloads/code
+i18n_dir: :lang
+skip_render:
+
+# Writing
+new_post_name: :title.md # File name of new posts
+default_layout: post
+titlecase: false # Transform title into titlecase
+external_link: true # Open external links in new tab
+filename_case: 0
+render_drafts: false
+post_asset_folder: false
+relative_link: false
+future: true
+highlight:
+  enable: true
+  line_number: true
+  auto_detect: false
+  tab_replace:
+
+# Home page setting
+# path: Root path for your blogs index page. (default = '')
+# per_page: Posts displayed per page. (0 = disable pagination)
+# order_by: Posts order. (Order by date descending by default)
+index_generator:
+  path: ''
+  per_page: 10
+  order_by: -date
+
+# Category & Tag
+default_category: uncategorized
+category_map:
+tag_map:
+
+# Date / Time format
+## Hexo uses Moment.js to parse and display date
+## You can customize the date format as defined in
+## http://momentjs.com/docs/#/displaying/format/
+date_format: YYYY-MM-DD
+time_format: HH:mm:ss
+
+# Pagination
+## Set per_page to 0 to disable pagination
+per_page: 10
+pagination_dir: page
+
+# Extensions
+## Plugins: https://hexo.io/plugins/
+## Themes: https://hexo.io/themes/
+theme: hexo-theme-cactus
+
+theme_config:
+  colorscheme: white
+
+# Deployment
+## Docs: https://hexo.io/docs/deployment.html
+deploy:
+  type: