Build landing page from Penpot design, with multi-language switcher

Implement the "Desktop dark" Penpot design: nav, hero, about, products
teaser and contact form, with the exported logo and wave artwork and
self-hosted Poppins, Roboto Flex and Chillax fonts.

- Shared page markup in _includes/home.pug; copy in locales/{en,pl}.json
- Footer language switcher and hreflang tags generated from the locales
- Contact form composes a mailto: to the address in _data/site.json
- Stacked layout below 1024px

package-lock.json

@@ -622,7 +622,6 @@
       "integrity": "sha512-7VT13fmjotKpGipCW9JEQAusEPE+Ei8nl6/g4FBAmIm0GOOLMua9NDDo/DWp0ZAxCr3cPq5ZpBqmPAQgDda2Pw==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "anymatch": "~3.1.2",
         "braces": "~3.0.2",
@@ -1518,7 +1517,6 @@
       "integrity": "sha512-/imKNG4EbWNrVjoNC/1H5/9GFy+tqjGBHCaSsN+P2RnPqjsLmv6UD3Ej+Kj8nBWaRAwyk7kK5ZUc+OEatnTR3A==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "bin": {
         "jiti": "bin/jiti.js"
       }
@@ -2077,7 +2075,6 @@
         }
       ],
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "nanoid": "^3.3.16",
         "picocolors": "^1.1.1",
@@ -2227,7 +2224,6 @@
       "integrity": "sha512-7Hc+IvlQ7hlaIfQFZnxlRl0jnpWq2qwibORBhQYIb0QbNtuicc5ZxvKkVT71HJ4Py1wSZ/3VR1r8LfkCtoCzhw==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "posthtml-parser": "^0.11.0",
         "posthtml-render": "^3.0.0"