Improve the style of the highlighted code after query execution for Dark mode. Fixes#4996.
Changed background pattern for geometry viewer to use #fff for all themes. Fixes#5077
Changed the color of selected and hovered item for Select2 dropdown, also tweak the appearance of the tags in multi-select boxes. Fixes#4955
Fixed Firefox monospaced issue by updating the font to the latest version. Fixes#5184
- Reformat source so it's wrapped.
- Standardise markup.
- Center images.
- Restructure in various places to improve the indexing.
- Remove duplicated Query Tool toolbar descriptions.
- Ensure the structure works in both HTML and LaTeX.
