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.
 
@@ -25,10 +25,10 @@ This component requires that a headless-capable web browser is installed on your
 </p>
 
 <p class='note warning'>
-  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. 
+  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.
 
@@ -38,18 +38,17 @@ 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.
 
 OS-specific instructions:
 - [Ubuntu 16](https://gist.github.com/ziadoz/3e8ab7e944d02fe872c3454d17af31a5) (Selenium server portion *not* necessary)
-- [RHEL/Centos 7](https://stackoverflow.com/a/46686621) 
+- [RHEL/Centos 7](https://stackoverflow.com/a/46686621)
 
 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.