Reorganize sample directory (#34)

This should help keep things organized as speedscope supports more languages & more formats

Test Plan: Try importing from every single file type, see that the link to load the example profile still works

application.tsx

@@ -17,7 +17,7 @@ import {importFromFirefox} from './import/firefox'
 import {importFromInstrumentsDeepCopy} from './import/instruments'
 
 declare function require(x: string): any
-const exampleProfileURL = require('./sample/perf-vertx-stacks-01-collapsed-all.txt')
+const exampleProfileURL = require('./sample/profiles/stackcollapse/perf-vertx-stacks-01-collapsed-all.txt')
 
 const enum SortOrder {
   CHRONO,
@@ -88,7 +88,7 @@ function importProfile(contents: string, fileName: string): Profile | null {
       // If every line ends with a space followed by a number, it's probably
       // the collapsed stack format.
       const lineCount = contents.split(/\n/).length
-      if (lineCount > 1 && lineCount === contents.split(/ \d+\n/).length) {
+      if (lineCount >= 1 && lineCount === contents.split(/ \d+\n/).length) {
         console.log('Importing as collapsed stack format')
         return importFromBGFlameGraph(contents)
       }

sample/simple-firefox.html

@@ -1 +0,0 @@
-<script src="./simple.js"></script>

sample/simple.js

@@ -1,24 +0,0 @@
-function a() {
-  b();
-  c();
-}
-
-function b() {
-  d();
-}
-
-function c() {
-  d();
-}
-
-function d() {
-  let prod = 1;
-  for (let i = 1; i < 10000000; i++) {
-    prod *= i
-  }
-  return prod;
-}
-
-console.profile('a')
-a();
-console.profileEnd('a')