Rename 'comparisons' to 'Ecosystem Overview'

'comparisons' felt a bit out-of-context on the summary/sidebar.

book/src/SUMMARY.md

@@ -27,5 +27,5 @@
   - [Syntax](./uplc/syntax.md)
   - [Command-line utilities](./uplc/cli.md)
   - [Builtins](./uplc/builtins.md)
-- [Comparisons](./comparisons.md)
+- [Ecosystem Overview](./ecosystem-overview.md)
 - [Resources](./resources.md)

book/src/ecosystem-overview.md

@@ -1,4 +1,4 @@
-# Comparisons
+# Ecosystem Overview
 
 Within the Cardano community there has been a flourishing ecosystem
 of alternative languages for writing smart contracts. So naturally, one might ask about