[EN] Diff rendering improvements in version control

Improve diff rendering in version control feature to be more fine-grained when showing attribute changes. 1- View mode - Inline changes - unfied. Similar to the current. - Side by side mode 2- Change highlight - Highlight character addition/deletion within paragraph. 3- Colors - Addition and removal colors are a Sass variable. (developer friendly customitzation) Version control is used in: - Proposals - Collaborative draft - Amendments - Accountability