pluma 1.23.0 release

Changes since the last release: v1.22.1...v1.23.0

pluma 1.23.0

• Translations update
• Create FUNDING.yml
• Reindent all Python sources to ts=4. Strip trailing spaces.
• remove live.gnome from plugins section
• add quick open to readme
• add readmes and update plugins section of manual
• update how pluma can be opened from menu
• [ci] Add cppcheck html report
• [ci] Enable Clang Static Analyzer
• Help: replace link linkend with xref linkend
• Yelp viewer can't open cross-references to other parts of
• the manual using link linkend.
• update installation instructions and fix spelling and old reference
• help: update copyright
• Use ITS in docbook article info, validate with dbits schemas
• Upgrade the manual to docbook 5.0