feat: clean doc dir

src/2020-05/001-get-started/001-installation.md

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+# installation
+
+```shell
+npm install -g typescript
+```

src/2020-05/001-get-started/code/001-greeter.js

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+/**
+ *
+ * cd /Users/feizheng/github/typescript-notes/src/2020-05/001-get-started/code
+ * tsc 001-greeter.ts
+ */
+function greeter(person) {
+    return "Hello, " + person;
+}
+var user = "Jane User";
+document.body.innerHTML = greeter(user);

src/2020-05/001-get-started/code/001-greeter.ts

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+/**
+ *
+ * cd /Users/feizheng/github/typescript-notes/src/2020-05/001-get-started
+ * tsc 001-greeter.ts
+ */
+
+
+function greeter(person: string) {
+  return "Hello, " + person;
+}
+
+let user = "Jane User";
+
+document.body.innerHTML = greeter(user);
+
+
+

src/2020-05/001-get-started/code/002-person.js

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+function greeter(person) {
+    return "Hello, " + person.firstName + " " + person.lastName;
+}
+var user = { firstName: "Jane", lastName: "User" };
+document.body.innerHTML = greeter(user);

src/2020-05/001-get-started/code/002-person.ts

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+interface Person{
+  firstName: string,
+  lastName: string
+}
+
+
+function greeter(person:Person) {
+  return "Hello, " + person.firstName + " " + person.lastName;
+}
+
+
+let user = { firstName: "Jane", lastName: "User" };
+
+document.body.innerHTML = greeter(user);