Remove faulty/unneeded .gemspec file, bump CI packages (#196)

* try remove gemspec

* edit Gemfile, update CI containers

* bump npm requirements

* add gh pages gem

* exclude [vendor]

* exclude vendor, no []

.circleci/config.yml

@@ -3,7 +3,7 @@ jobs:
 
     lint:
         docker:
-            - image: circleci/node:stretch
+            - image: cimg/node:lts
         steps:
             - checkout
             - run:
@@ -20,7 +20,7 @@ jobs:
 
     build:
         docker:
-            - image: circleci/ruby:stretch
+            - image: cimg/ruby:3.0
         steps:
             - checkout
 
@@ -29,16 +29,22 @@ jobs:
                 keys:
                   - gem-cache-0-{{ checksum "./Gemfile" }}
 
+            - run:
+                name: check versions
+                command: |
+                    gem --version
+                    bundle --version
+
             - run:
                 name: install
                 command: |
-                    gem install jekyll bundler
-                    bundle install --path vendor/bundle
+                    bundle config set --local path 'vendor/bundle'
+                    bundle install
 
             - run:
                 name: build
                 command: |
-                    bundle exec jekyll build --baseurl /0/_site
+                    bundle exec jekyll build --baseurl /0/_site --verbose
 
             - store_artifacts:
                 path: _site

Gemfile

@@ -1,6 +1,4 @@
-# frozen_string_literal: true
-
 source 'https://rubygems.org'
 
-gemspec
-gem 'jekyll-redirect-from'
+gem 'jekyll-redirect-from'
+gem 'github-pages', group: :jekyll_plugins

_config.yml

@@ -46,8 +46,6 @@ include:
   - _posts
 
 exclude:
-  - script
-  - docs
   - README.md
   - Gemfile*
-  - jekyll-theme-cayman.gemspec
+  - vendor

npm-requirements.txt

@@ -1,2 +1,2 @@
-remark-cli@8.0.0
-[email protected]
+remark-cli@^10.0.0
+remark-preset-lint-recommended@^4.0.0