chore: update .gitignore, remove legacy files (#13)

Author: ronaldtse

.gitignore

@@ -1,9 +1,26 @@
-.DS_Store
+!sources/**/*.xml
 *.abort
+*.doc
 *.err
-relaton/
-.vscode/
+*.html
+*.pdf
+*.rxl
+*.swp
+*.tmp.xml
+*.xml
+*_files/
+*_images/
+.DS_Store
+.bundle/
+.idea/
 .ruby-lsp/
+.vscode/
 Gemfile.lock
-iev/
 _site/
+deploy_key
+deploy_key.enc
+deploy_key.pub
+documents/
+iev/
+published/
+relaton/