Remove unused files (rescript-lang#8481)

* Remove unused files

* Update CHANGELOG.md

Signed-off-by: Pedro Castro <aspeddro@gmail.com>

Author: aspeddro

.ocamlformat-ignore

@@ -1,4 +1,2 @@
-compiler/js_parser/**
 **/*.cppo.ml
 **/*.cppo.mli
-compiler/syntax/compiler-libs-406/*

.python-version

@@ -69,6 +69,7 @@
 - Refactor analysis CLI helpers to use source input. https://github.com/rescript-lang/rescript/pull/8466
 - Include syntax, gentype, analysis, tools, and reanalyze tests in coverage reports. https://github.com/rescript-lang/rescript/pull/8467
 - Remove the unreachable `Longident.Lapply` constructor (OCaml's applicative-functor path syntax `F(X).t`, which ReScript's grammar cannot produce). https://github.com/rescript-lang/rescript/pull/8469
+- Remove unused files. https://github.com/rescript-lang/rescript/pull/8481
 
 # 13.0.0-alpha.4