Delete sensor.yahoo_finance (#7107)

* Delete sensor.yahoo_finance

* Delete yahoo_finance logo

source/_components/sensor.yahoo_finance.markdown

@@ -1,59 +0,0 @@
----
-layout: page
-title: "Yahoo Finance"
-description: "Instructions on how to setup Yahoo Finance within Home Assistant."
-date: 2016-09-18 21:00
-sidebar: true
-comments: false
-sharing: true
-footer: true
-logo: yahoo_finance.png
-ha_category: Finance
-ha_iot_class: "Cloud Polling"
-featured: false
-ha_release: 0.29
----
-
-<p class='note warning'>
-  This sensor doesn't work anymore as [Yahoo!](https://yahoo.uservoice.com/forums/382977-finance/suggestions/32103877-yahoo-stock-quote-api-please-bring-back) decommissioned the service in early November 2017. A repleacement is the [`alpha_vantage` sensor](/components/sensor.alpha_vantage/).
-</p>
-
-The `yahoo_finance` platform uses [Yahoo Finance](https://finance.yahoo.com/) to monitor the stock market.
-
-## {% linkable_title Configuration %}
-
-To enable the `yahoo_finance` platform, add the following lines to your `configuration.yaml` file:
-
-```yaml
-# Example configuration.yaml entry
-sensor:
-  - platform: yahoo_finance
-```
-
-{% configuration %}
-name:
-  description: The name of the sensor.
-  required: false
-  type: string
-  default: Yahoo Stock
-symbols:
-  description: List of stock market symbols for given companies.
-  required: false
-  type: string, list
-  default: YHOO
-{% endconfiguration %}
-
-## {% linkable_title Examples %}
-
-In this section you find some real-life examples of how to use this sensor.
-
-### {% linkable_title Red Hat and Google %}
-
-```yaml
-sensor:
-  - platform: yahoo_finance
-    symbols:
-      - RHT
-      - GOOGL
-```
-