feat: NEWS with version-specific feature information

NEWS.md

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+## `v 1.1.0` Features
+
+Changes from the prior version are listed below:
+
+- Increased contrast of code chunk outputs relative to background (especially in dark mode)
+
+## `v 1.0.0` Features
+
+This is the first version of this extension. It included:
+
+- Light and dark mode for LTER education-related Quarto websites
+- SCSS rules for increased contrast for tabset header/panel content relative to the background
+- SCSS rule for emphasis color in active dropdown menu option
+- Hyperlinks underlined by default