[web] Use regular or light icons instead of bold.

web/archetypes/books.pandoc

web/assets/js/header-anchor.js

web/content/_index.pandoc

web/content/books/bmb-2.pandoc

web/content/books/bmb-3.pandoc

web/content/books/bmb-4.pandoc

web/content/books/computational-geotechnics-i.pandoc

...omputational-hydrology-i-groundwater-flow-modeling.pandoc

web/content/books/computational-hydrology-ii.pandoc

web/content/books/computational-hydrology-iii.pandoc

web/content/books/geoenergy-modeling-i.pandoc

web/content/books/geoenergy-modeling-ii.pandoc

web/content/books/geoenergy-modeling-iii.pandoc

...ontent/books/models-of-thermochemical-heat-storage.pandoc

web/content/docs/_index.pandoc

web/content/docs/devguide/advanced/build-with-ninja.pandoc

...ntent/docs/devguide/advanced/conan-package-manager.pandoc

...ntent/docs/devguide/advanced/third-party-libraries.pandoc

web/content/docs/devguide/advanced/using-ccache.pandoc

.../docs/devguide/getting-started/build-configuration.pandoc