feat(easy-typography): initial implementation

easy-typography/src/constants.typ

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+// Constants
+
+// space above H1
+#let heading-above-max = 1.25em
+
+// space above H5
+#let heading-above-min = 0.80em
+
+// space below H1
+#let heading-below-max = 0.65em
+
+// space below H5
+#let heading-below-min = 0.55em
+
+// font size for H1
+#let heading-size-max  = 1.10em
+
+// font size for H5
+#let heading-size-min  = 1.00em
+
+// default text weight -- light is best for reading, and printers are fine with
+// it these days
+#let body-weight       = "light"
+
+// line spacing -- tight; efficient but still readable with good fonts
+#let line-spacing      = 1.30
+
+// paragraph spacing -- defaults to a double-space
+#let paragraph-spacing = 1.70