(change): use node_modules/.cache/... as cacheRoot

- instead of outputting these to app root and requiring users to
  gitignore these directories, just output to node_modules/.cache/
  - rollup-plugin-typescript2 is the default cache directory, so this
    initially appended _${opts.format} to it
    - upon code review, changed it to tsdx/${opts.format}/
    - babel-loader similarly uses node_modules/.cache/babel-loader
      as its default cache directory and does not allow users to
      change it
      - parcel uses node_modules/.cache/parcel too
      - fuse-box uses node_modules/.fusebox

.gitignore

@@ -1,10 +1,6 @@
 *.log
 .DS_Store
 node_modules
-.rts2_cache_cjs
-.rts2_cache_esm
-.rts2_cache_umd
-.rts2_cache_system
 dist
 tester
 tester-react

src/createRollupConfig.ts

@@ -128,7 +128,7 @@ export function createRollupConfig(opts: TsdxOptions) {
       },
       typescript({
         typescript: require('typescript'),
-        cacheRoot: `./.rts2_cache_${opts.format}`,
+        cacheRoot: `./node_modules/.cache/tsdx/${opts.format}/`,
         tsconfig: opts.tsconfig,
         tsconfigDefaults: {
           compilerOptions: {

templates/basic/gitignore

@@ -1,8 +1,4 @@
 *.log
 .DS_Store
 node_modules
-.rts2_cache_cjs
-.rts2_cache_esm
-.rts2_cache_umd
-.rts2_cache_system
 dist

templates/react/gitignore

@@ -2,8 +2,4 @@
 .DS_Store
 node_modules
 .cache
-.rts2_cache_cjs
-.rts2_cache_esm
-.rts2_cache_umd
-.rts2_cache_system
 dist