Improve SEO (#62)

Reviewed-on: https://git.anonymousland.org/anonymousland/anonymousland/pulls/62

Gemfile

@@ -6,4 +6,5 @@ gem "jekyll-feed"
 gem "jekyll-seo-tag"
 gem "bundler"
 gem "kramdown-parser-gfm"
+gem "jekyll-sitemap"
 gem "webrick"

_config.yml

@@ -2,6 +2,10 @@ repository: anonymousland/anonymousland
 theme: jekyll-theme-potato-hacker
 theme_base: "dark"
 theme_switch: off
+title: Anonymousland
+email: admin@anonymousland.org
+url: https://anonymousland.org
+github_username: "anonyland"
 blog: on
 highlighter_theme: monokai
 toolbar_priority: 
@@ -24,6 +28,7 @@ exclude:
 plugins:
   - jekyll-feed
   - jekyll-seo-tag
+  - jekyll-sitemap
 feed:
   collections:
     - changelog

robots.txt

@@ -1,2 +1,4 @@
+Sitemap: https://anonymousland.org/sitemap.xml
+
 User-agent: *
-Disallow: /
+Allow: /