move _vars to outer ts folder

First step in sharing styling with graphs + future .html files

qt/tools/extract_scss_colors.py

@@ -6,7 +6,7 @@ import json
 
 colors = {}
 
-for line in open("ts/scss/_vars.scss"):
+for line in open("../ts/src/scss/_vars.scss"):
     line = line.strip()
     if not line:
         continue

qt/ts/Makefile

@@ -23,7 +23,7 @@ all: check
 PHONY: build
 build:
 	$(BIN)/tsc --build
-	$(BIN)/sass --no-source-map scss:css
+	$(BIN)/sass --no-source-map -I ../../ts/src/scss scss:css
 	rsync -a css/ ../aqt_data/web/
 
 .PHONY: check