feat: add support icons (#1)

Let's track the support icons used in the Vegvisir README here as well.

Reviewed-on: https://codeberg.org/vegvisir/branding/pulls/1
Co-authored-by: vlw <victor@vlw.se>
Co-committed-by: vlw <victor@vlw.se>

support/README.md

@@ -0,0 +1,11 @@
+# `/support`
+Support icons for Vegvisir documentation.
+
+The naming pattern for all icons should be:
+```
+[name]-[width]x[height].png
+```
+for example:
+```
+gecko-64x64.png
+```