rollup: polish configs

package.json

@@ -11,12 +11,12 @@
   ],
   "repository": "markdown-it/markdown-it",
   "license": "MIT",
-  "main": "dist/markdown-it.cjs.js",
+  "main": "dist/index.cjs.js",
   "module": "index.mjs",
   "exports": {
     ".": {
       "import": "./index.mjs",
-      "require": "./dist/markdown-it.cjs.js"
+      "require": "./dist/index.cjs.js"
     },
     "./*": {
       "require": "./*",
@@ -55,7 +55,6 @@
   "devDependencies": {
     "@rollup/plugin-babel": "^6.0.4",
     "@rollup/plugin-commonjs": "^25.0.7",
-    "@rollup/plugin-json": "^6.0.1",
     "@rollup/plugin-node-resolve": "^15.2.3",
     "@rollup/plugin-terser": "^0.4.4",
     "ansi": "^0.3.0",

support/demo_template/rollup.config.mjs

@@ -1,12 +1,10 @@
 import nodeResolve from '@rollup/plugin-node-resolve'
 import commonjs from '@rollup/plugin-commonjs'
-import json from '@rollup/plugin-json'
 import terser from '@rollup/plugin-terser'
 
 const plugins = [
   nodeResolve({ preferBuiltins: true }),
   commonjs(),
-  json({ namedExports: false }),
   // Here terser is used only to force ascii output
   terser({
     mangle: false,

support/rollup.config.mjs

@@ -9,7 +9,7 @@ const config_umd_full = {
   input: 'index.mjs',
   output: [
     {
-      file: 'dist/markdown-it.js',
+      file: `dist/${pkg.name}.js`,
       format: 'umd',
       name: 'markdownit',
       plugins: [
@@ -22,7 +22,7 @@ const config_umd_full = {
       ]
     },
     {
-      file: 'dist/markdown-it.min.js',
+      file: `dist/${pkg.name}.min.js`,
       format: 'umd',
       name: 'markdownit',
       plugins: [
@@ -46,7 +46,7 @@ const config_umd_full = {
 const config_cjs_no_deps = {
   input: 'index.mjs',
   output: {
-    file: 'dist/markdown-it.cjs.js',
+    file: 'dist/index.cjs.js',
     format: 'cjs'
   },
   external: Object.keys(pkg.dependencies),