chore: harmonize repo - fix metanorma.yml, remove Gemfile.lock, update .gitignore (#6)

Author: ronaldtse

.bundle/config

@@ -0,0 +1,24 @@
+_site/
+*.html
+*.doc
+*.pdf
+*.xml
+!sources/**/*.xml
+*.rxl
+*_images/
+*_files/
+documents/
+published/
+relaton/
+*.abort
+*.err
+*.tmp.xml
+.bundle/
+deploy_key
+deploy_key.pub
+deploy_key.enc
+Gemfile.lock
+.DS_Store
+*.swp
+.vscode/
+.idea/