Playpen Sans: Version 1.001 added (#6746)

* [gftools-packager] Playpen Sans: Version 1.001 added

* Playpen Sans Version 1.001 taken from the upstream repo https://github.com/TypeTogether/Playpen-Sans at commit TypeTogether/Playpen-Sans@de384a1.

* Small fixes to DESCRIPTION.en_us.html

* DESCRIPTION.en_us.html url fix

* METADATA.pb symbols subset + stroke added

* METADATA.pb subsets fix

* METADATA.pb: `math` subsetting added

ofl/playpensans/DESCRIPTION.en_us.html

@@ -2,7 +2,7 @@
 Playpen Sans is one of the font families produced by TypeTogether after more than two years of primary research into handwriting education for Latin-based languages. It has seven automatic alternates for each character and a built-in shuffler that both ensures variation and avoids repetitive shapes in close proximity. This feature adds to the overall organic, spontaneous, and authentic feel of the handwritten style.
 </p>
 <p>
-Playpen Sans is a variable font with a weight range from Thin to Extrabold, including support for over 150 Latin-based languages and a set of reward icons.</p>
+Playpen Sans is a variable font with a weight range from Thin to Extrabold, including support for over 150 Latin-based languages and a set of reward icons.
 </p>
 <p>
 To contribute, see <a href="https://github.com/TypeTogether/Playpen-Sans">github.com/TypeTogether/Playpen-Sans</a>

ofl/playpensans/METADATA.pb

@@ -14,14 +14,18 @@ fonts {
 }
 subsets: "latin"
 subsets: "latin-ext"
+subsets: "math"
 subsets: "menu"
+subsets: "symbols"
 subsets: "vietnamese"
+
 axes {
   tag: "wght"
   min_value: 100.0
   max_value: 800.0
 }
 source {
   repository_url: "https://github.com/TypeTogether/Playpen-Sans"
-  commit: "114342f694edaa1f63a51cbb216a10120fc271b5"
+  commit: "de384a1c4e7fd55f020dedeba4a87740d4ad6ef1"
 }
+stroke: "SANS_SERIF"