Update cheatsheets

tldr/linux/fonttools-subset

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# fonttools subset
+
+> Generate subsets of fonts or optimize file sizes.
+> More information: <https://fonttools.readthedocs.io/en/latest/subset/index.html>.
+
+- Subset a TTF font file to the Basic Latin Unicode block:
+
+`fonttools subset {{path/to/font.ttf}} --unicodes=U+0000-007F`
+
+- Change the file type to WOFF2:
+
+`fonttools subset {{path/to/font.ttf}} --unicodes=U+0000-007F --flavor=woff2`
+
+- Keep only the onum (oldstyle figures) and kern (kerning) OpenType font features:
+
+`fonttools subset {{path/to/font.ttf}} --unicodes=U+0000-007F --layout-features=onum,kern`
+
+- Set the output file's name:
+
+`fonttools subset {{path/to/font.ttf}} --unicodes=U+0000-007F --output-file={{path/to/subset.ttf}}`