removing theme-gem and updated plugins

Gemfile

@@ -1,7 +1,7 @@
 source "https://rubygems.org"
 
 gem 'jekyll', '~> 4.2', '>= 4.1.1'
-gem 'bundler'
+gem 'bundler', '~> 2.2.6'
 gem 'kramdown'
 gem 'rack-jekyll'
 gem 'rake'
@@ -14,8 +14,9 @@ gem 'puma'
 
 # Plugins
 group :jekyll_plugins do
-    gem 'devlopr', '~> 0.4.5'
+    # gem 'devlopr', '~> 0.4.5'
     gem 'jgd', '~> 1.12'
+    gem 'jekyll-feed', '~> 0.13.0'
     gem 'jekyll-paginate', '~> 1.1.0'
     gem 'jekyll-gist', '~> 1.5.0'
     gem 'jekyll-seo-tag', '~> 2.6.1'

Gemfile.lock

@@ -6,13 +6,6 @@ GEM
     backports (3.21.0)
     colorator (1.1.0)
     concurrent-ruby (1.1.8)
-    devlopr (0.4.5)
-      jekyll (>= 3.5, < 5.0)
-      jekyll-feed (~> 0.13.0)
-      jekyll-gist (~> 1.5.0)
-      jekyll-paginate (~> 1.1.0)
-      jekyll-seo-tag (~> 2.6.1)
-      jekyll-sitemap (~> 1.4.0)
     em-websocket (0.5.2)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
@@ -142,10 +135,10 @@ PLATFORMS
   x64-mingw32
 
 DEPENDENCIES
-  bundler
-  devlopr (~> 0.4.5)
+  bundler (~> 2.2.6)
   jekyll (~> 4.2, >= 4.1.1)
   jekyll-admin (~> 0.11.0)
+  jekyll-feed (~> 0.13.0)
   jekyll-gist (~> 1.5.0)
   jekyll-menus (~> 0.6.1)
   jekyll-paginate (~> 1.1.0)