Same ruby version and update styles.

_config.yml

@@ -1,9 +1,23 @@
+# ========================================
+# Default configuration
+# ========================================
+
 theme: jekyll-theme-chirpy
 
 baseurl: '/jrpotter.github.io'
 
+lang: en
+
 timezone: America/New_York
 
+avatar: https://avatars.githubusercontent.com/u/3267697?v=4
+
+paginate: 20
+
+# ========================================
+# jekyll-seo-tag settings
+# ========================================
+
 title: Joshua Potter
 
 tagline: A temporary tagline
@@ -11,6 +25,8 @@ tagline: A temporary tagline
 description: >-
   A temporary description.
 
+url: 'https://jrpotter.github.io'
+
 github:
   username: jrpotter
 
@@ -19,22 +35,79 @@ social:
   links:
     - https://github.com/jrpotter
 
-avatar: https://avatars.githubusercontent.com/u/3267697?v=4
+# ========================================
+# Markdown
+# ========================================
 
-toc: true
-
-disqus:
-  comments: false
-
-paginate: 20
-
-# Replace ruby-rogue with PrismJS.
-markdown: kramdown
 kramdown:
+  syntax_highlighter: rouge
   syntax_highlighter_opts:
-    disable : true
+    css_class: highlight
-site-css:
+    span:
-  - /assets/css/prism.css
+      line_numbers: false
-  - /assets/css/site.css
+    block:
-site-js:
+      line_numbers: true
-  - /assets/js/prism.js
+      start_line: 1
+
+collections:
+  tabs:
+    output: true
+    sort_by: order
+
+defaults:
+  -
+    scope:
+      # An empty string here means all files in the project
+      path: ''
+      type: posts
+    values:
+      layout: post
+      comments: false
+      toc: true
+      # DO NOT modify the following parameter unless you are confident enough
+      # to update the code of all other post links in this project.
+      permalink: /posts/:title/
+  -
+    scope:
+      path: _drafts
+    values:
+      comments: false
+  -
+    scope:
+      path: ''
+      type: tabs
+    values:
+      layout: page
+      permalink: /:title/
+
+sass:
+  style: compressed
+
+compress_html:
+  clippings: all
+  comments: all
+  endings: all
+  profile: false
+  blanklines: false
+  ignore:
+    envs: [development]
+
+exclude:
+  - '*.gem'
+  - '*.gemspec'
+  - tools
+  - docs
+  - README.md
+  - LICENSE
+  - gulpfile.js
+  - node_modules
+  - package*.json
+
+jekyll-archives:
+  enabled: [categories, tags]
+  layouts:
+    category: category
+    tag: tag
+  permalinks:
+    tag: /tags/:name/
+    category: /categories/:name/

_tabs/about.md

@@ -4,5 +4,4 @@ icon: fas fa-info-circle
 order: 4
 ---
 
-
+This is an about page.
-> **Note**: Add Markdown syntax content to file `_tabs/about.md` and it will show up on this page.

assets/css/prism.css

@@ -1,3 +0,0 @@
-/* PrismJS 1.25.0
-https://prismjs.com/download.html#themes=prism-tomorrow&languages=markup+css+clike+javascript+abap+abnf+actionscript+ada+agda+al+antlr4+apacheconf+apex+apl+applescript+aql+arduino+arff+asciidoc+aspnet+asm6502+asmatmel+autohotkey+autoit+avisynth+avro-idl+bash+basic+batch+bbcode+bicep+birb+bison+bnf+brainfuck+brightscript+bro+bsl+c+csharp+cpp+cfscript+chaiscript+cil+clojure+cmake+cobol+coffeescript+concurnas+csp+coq+crystal+css-extras+csv+cypher+d+dart+dataweave+dax+dhall+diff+django+dns-zone-file+docker+dot+ebnf+editorconfig+eiffel+ejs+elixir+elm+etlua+erb+erlang+excel-formula+fsharp+factor+false+firestore-security-rules+flow+fortran+ftl+gml+gap+gcode+gdscript+gedcom+gherkin+git+glsl+gn+go+go-module+graphql+groovy+haml+handlebars+haskell+haxe+hcl+hlsl+hoon+http+hpkp+hsts+ichigojam+icon+icu-message-format+idris+ignore+inform7+ini+io+j+java+javadoc+javadoclike+javastacktrace+jexl+jolie+jq+jsdoc+js-extras+json+json5+jsonp+jsstacktrace+js-templates+julia+keepalived+keyman+kotlin+kumir+kusto+latex+latte+less+lilypond+liquid+lisp+livescript+llvm+log+lolcode+lua+magma+makefile+markdown+markup-templating+matlab+maxscript+mel+mermaid+mizar+mongodb+monkey+moonscript+n1ql+n4js+nand2tetris-hdl+naniscript+nasm+neon+nevod+nginx+nim+nix+nsis+objectivec+ocaml+opencl+openqasm+oz+parigp+parser+pascal+pascaligo+psl+pcaxis+peoplecode+perl+php+phpdoc+php-extras+plsql+powerquery+powershell+processing+prolog+promql+properties+protobuf+pug+puppet+pure+purebasic+purescript+python+qsharp+q+qml+qore+r+racket+cshtml+jsx+tsx+reason+regex+rego+renpy+rest+rip+roboconf+robotframework+ruby+rust+sas+sass+scss+scala+scheme+shell-session+smali+smalltalk+smarty+sml+solidity+solution-file+soy+sparql+splunk-spl+sqf+sql+squirrel+stan+iecst+stylus+swift+systemd+t4-templating+t4-cs+t4-vb+tap+tcl+tt2+textile+toml+tremor+turtle+twig+typescript+typoscript+unrealscript+uri+v+vala+vbnet+velocity+verilog+vhdl+vim+visual-basic+warpscript+wasm+web-idl+wiki+wolfram+wren+xeora+xml-doc+xojo+xquery+yaml+yang+zig */
-code[class*=language-],pre[class*=language-]{color:#ccc;background:0 0;font-family:Consolas,Monaco,'Andale Mono','Ubuntu Mono',monospace;font-size:1em;text-align:left;white-space:pre;word-spacing:normal;word-break:normal;word-wrap:normal;line-height:1.5;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-hyphens:none;-moz-hyphens:none;-ms-hyphens:none;hyphens:none}pre[class*=language-]{padding:1em;margin:.5em 0;overflow:auto}:not(pre)>code[class*=language-],pre[class*=language-]{background:#2d2d2d}:not(pre)>code[class*=language-]{padding:.1em;border-radius:.3em;white-space:normal}.token.block-comment,.token.cdata,.token.comment,.token.doctype,.token.prolog{color:#999}.token.punctuation{color:#ccc}.token.attr-name,.token.deleted,.token.namespace,.token.tag{color:#e2777a}.token.function-name{color:#6196cc}.token.boolean,.token.function,.token.number{color:#f08d49}.token.class-name,.token.constant,.token.property,.token.symbol{color:#f8c555}.token.atrule,.token.builtin,.token.important,.token.keyword,.token.selector{color:#cc99cd}.token.attr-value,.token.char,.token.regex,.token.string,.token.variable{color:#7ec699}.token.entity,.token.operator,.token.url{color:#67cdcc}.token.bold,.token.important{font-weight:700}.token.italic{font-style:italic}.token.entity{cursor:help}.token.inserted{color:green}

assets/css/site.css

@@ -1,3 +0,0 @@
-code[class*="language-"], pre[class*="language-"] {
-  font-size: 0.95rem;
-}

assets/css/style.scss

@@ -0,0 +1,16 @@
+---
+---
+
+/*
+  If the number of TAB files has changed, the following variable is required.
+  And it must be defined before `@import`.
+*/
+$tab-count: {{ site.tabs | size | plus: 1 }}; // plus 1 for home tab
+
+@import "{{ site.theme }}";
+
+/* Custom CSS */
+
+#page {
+  padding-top: 20px;
+}

flake.nix

@@ -10,7 +10,7 @@
     flake-utils.lib.eachDefaultSystem (system:
       let
         pkgs = nixpkgs.legacyPackages.${system};
-        ruby = pkgs.ruby;
+        ruby = pkgs.ruby_2_7;
         gems = pkgs.bundlerEnv {
           name = "pages-env";
           inherit ruby;