GFK Q3 content bug fixes (Oct 19) (#5434)

GFK Q3 content bug fixes (Oct 19) (#5434)

* Excerpt for “CJK”

* Rel. lesson for “CJK”

* related_lessons for “Alphabet”

* Excerpt for “Alphabet”

* related_lessons for “Designspace”

* Excerpt for “Designspace”

* related_lessons in “Tofu”

* Excerpt for “Tofu”

* related_lessons for “Rag”

* Excerpt for “Rag”

* related_lessons for “Letters”

* Excerpt for “Letters”

* related_lessons for “Reflow”

* Excerpt for “Reflow”

* related_lessons for “Emoji”

* Excerpt for “Emoji”

* Correcting case in `type_history` topic

* Revised content for `variable_fonts_are_here`

* Revised content for `web_font_comparisons_variable_vs_static`

* Revised content for `optimizing_typographic_space_with_variable_fonts`

* Revised content for `interactive_animations_with_variable_fonts`

* Revised content for `factors_that_influence_the_efficiency_of_variable_web_fonts`

* New VF image files from Nick

* Turning full GFK URLs into proper internal format

* Placing Nick’s new VF illustrations

* Excerpt for “Switching...”

* Editing placeholder ALT text everywhere

* Fixing broken URLs in Nick’s articles

* Fixing “legibility” and “readability” URLs in Darrell’s article

* New `thumbnail` SVGs for Nick’s module

* New module ordering for homepage

* New thumbnails (+ references) for History module

* Updating `color` term to differentiate from color fonts

* Correcting `related_terms` for Hangeul articles

* Module desc. for Hangeul

* Numerous copy (mainly punc.) tweaks to Hangeul articles

* 5 × Hangeul article `excerpt`s

* All ACTUAL alt text, everywhere!

* All ACTUAL `excerpt`s, everywhere!

* Renaming “Hangeul” module to “Designing Hangeul”

* More format tweaking for Hangeul articles

* Prev/next lessons for Nick’s module

* Temporarily removing problematic GIFs

* Adding `thumbnail.svg` back in