feat: text mixin 추가

Author: sikkzz

src/styles/_mixins.scss

@@ -0,0 +1,49 @@
+@mixin titleLg {
+  font-size: $font-size-xl;
+  font-weight: $font-weight-bold;
+}
+
+@mixin titleMd {
+  font-size: $font-size-lg;
+  font-weight: $font-weight-bold;
+}
+
+@mixin titleSm {
+  font-size: $font-size-md;
+  font-weight: $font-weight-bold;
+}
+
+@mixin bodyLg {
+  font-size: $font-size-default;
+  font-weight: $font-weight-medium;
+}
+
+@mixin bodyMd {
+  font-size: $font-size-sm;
+  font-weight: $font-weight-medium;
+}
+
+@mixin bodySm {
+  font-size: $font-size-xs;
+  font-weight: $font-weight-medium;
+}
+
+@mixin bodyXsm {
+  font-size: $font-size-xxs;
+  font-weight: $font-weight-medium;
+}
+
+@mixin buttonMd {
+  font-size: $font-size-default;
+  font-weight: $font-weight-semi-bold;
+}
+
+@mixin buttonSm {
+  font-size: $font-size-default;
+  font-weight: $font-weight-medium;
+}
+
+@mixin buttonXs {
+  font-size: $font-size-xs;
+  font-weight: $font-weight-medium;
+}