Update USPS configuration (#7023)

Using new config vars
Add linkable titles
Remove trailing spaces

source/_components/usps.markdown

@@ -16,7 +16,7 @@ ha_iot_class: "Cloud Polling"
 The `usps` platform allows one to track deliveries and inbound mail from the [US Postal Service (USPS)](https://www.usps.com/).
 In addition to having a USPS account, you will need to complete the "Opt-In" process for packages by clicking "Get Started Now" on [this page](https://my.usps.com/mobileWeb/pages/intro/start.action). You must also "Opt-In" to [Informed Delivery](https://informeddelivery.usps.com/box/pages/intro/start.action) to see inbound mail.
 
-## Prerequisites
+## {% linkable_title Prerequisites %}
 
 This component requires that a headless-capable web browser is installed on your system - either PhantomJS or Google Chrome. Preferably use Chrome if your operating system supports it, since PhantomJS is deprecated.
 
@@ -28,7 +28,7 @@ This component requires that a headless-capable web browser is installed on your
   Hass.io containers are based on Alpine Linux. PhanthomJS is not available for Alpine Linux. Therefore it is currently not possible to use this component on Hass.io.
 </p>
 
-### PhantomJS
+### {% linkable_title PhantomJS %}
 
 Install the latest version of [PhantomJS]( http://phantomjs.org/download.html). Ensure the executable is on your `PATH`. `phantomjs --version` should work and report the correct version. This is the default option and requires no further configuration.
 
@@ -38,8 +38,7 @@ Install the latest version of [PhantomJS]( http://phantomjs.org/download.html).
 
 If you use the PhantomJS option, specify `driver: phantomjs` in your `usps` configuration.
 
-
-### Chrome
+### {% linkable_title Chrome %}
 
 Install Chrome 59 or greater (preferably the most recent). Install the latest [Chromedriver](https://sites.google.com/a/chromium.org/chromedriver/downloads). Ensure both executables are on your `PATH`. `google-chrome --version` and `chromedriver --version` should work and report the correct version.
 
@@ -49,7 +48,7 @@ OS-specific instructions:
 
 If you use the Chrome option, specify `driver: chrome` in your `usps` configuration.
 
-## Configuration
+## {% linkable_title Configuration %}
 
 To enable this component, add the following lines to your `configuration.yaml`:
 
@@ -62,12 +61,26 @@ usps:
 
 You will see two new sensors, one for packages and one for mail and a camera to rotate through images of incoming mail for the current day.
 
-Configuration options for the USPS component:
-
-- **username** (*Required*): The username to access the MyUSPS service.
-- **password** (*Required*): The password for the given username.
-- **driver** (*Required*): Specify if you're using `phantomjs` or `chrome`.
-- **name** (*Optional*): Prefix for sensor names (defaults to "USPS")
+{% configuration %}
+username:
+  description: The username to access the MyUSPS service.
+  required: true
+  type: string
+password:
+  description: The password for the given username.
+  required: true
+  type: string
+driver:
+  description: Specify if you're using `phantomjs` or `chrome`.
+  required: false
+  type: string
+  default: phantomjs
+name:
+  description: The prefix for sensor names.
+  required: false
+  type: string
+  default: usps
+{% endconfiguration %}
 
 <p class='note warning'>
 The USPS sensor logs into the MyUSPS website to scrape package data. It does not use an API.