doc: label theme as non-source

ChALkeR · ChALkeR · commit 6d89df0dfcfd · 2026-01-27T18:23:17.000+04:00
diff --git a/.gitattributes b/.gitattributes
@@ -1,2 +1,3 @@
 tests/wpt/fixtures/** linguist-vendored
 tests/** linguist-documentation
+theme/** linguist-documentation

Original file line number	Diff line number	Diff line change
`@@ -1,2 +1,3 @@`
`1`	`1`	`tests/wpt/fixtures/** linguist-vendored`
`2`	`2`	`tests/** linguist-documentation`
	`3`	`+theme/** linguist-documentation`