return to minima theme

doc/Gemfile

@@ -4,4 +4,4 @@ source 'https://rubygems.org'
 
 gem "jekyll", "~> 4.2"
 
-gem "jekyll-theme-simplex"
+gem "minima", git: "https://github.com/jekyll/minima"

doc/Gemfile.lock

@@ -1,3 +1,12 @@
+GIT
+  remote: https://github.com/jekyll/minima
+  revision: 1d5286cf9a1aae34078420d183d560dd673d98b5
+  specs:
+    minima (3.0.0.dev)
+      jekyll (>= 3.5, < 5.0)
+      jekyll-feed (~> 0.9)
+      jekyll-seo-tag (~> 2.1)
+
 GEM
   remote: https://rubygems.org/
   specs:
@@ -42,10 +51,12 @@ GEM
       safe_yaml (~> 1.0)
       terminal-table (>= 1.8, < 4.0)
       webrick (~> 1.7)
+    jekyll-feed (0.17.0)
+      jekyll (>= 3.7, < 5.0)
     jekyll-sass-converter (3.0.0)
       sass-embedded (~> 1.54)
-    jekyll-theme-simplex (0.9.8.15)
-      jekyll (~> 4.0)
+    jekyll-seo-tag (2.8.0)
+      jekyll (>= 3.8, < 5.0)
     jekyll-watch (2.2.1)
       listen (~> 3.0)
     kramdown (2.4.0)
@@ -100,7 +111,7 @@ PLATFORMS
 
 DEPENDENCIES
   jekyll (~> 4.2)
-  jekyll-theme-simplex
+  minima!
 
 BUNDLED WITH
    2.5.13

doc/_config.yml

@@ -28,7 +28,7 @@ url: "https://heplean.github.io" # the base hostname & protocol for your site, e
 github_username:  HEPLean
 
 # Build settings
-theme: jekyll-theme-simplex
+theme: minima
 
 # The following items will not be processed, by default.
 # Any item listed under the `exclude:` key here will be automatically added to