New Source: Exeter City Council, UK (#948)

* initial commit with test cases

* exeter .md added

* update_docu_links run

* icon map updated

doc/source/exeter_gov_uk.md

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+# Exeter City Council
+
+Support for schedules provided by [Exeter City Council](https://exeter.gov.uk/), serving Exeter City, UK.
+
+## Configuration via configuration.yaml
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: exeter_gov_uk
+      args:
+        uprn: UPRN
+```
+
+### Configuration Variables
+
+**uprn**
+*(string) (optional)*
+
+
+## Examples
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: exeter_gov_uk
+      args:
+        uprn: "10013049539"
+```
+
+## How to find your UPRN
+
+An easy way to discover your Unique Property Reference Number (UPRN) is by looking at the url of you collection schedule on the Exeter City Council website. The set of numbers at teh end of the url are your uprn.
+
+For example: 
+_exeter.gov.uk/bins-and-recycling/bin-collections/when-is-my-bin-collected/?UPRN=`10013049539`_
+
+Alternatively, you can go to  to [Find My Address](https://www.findmyaddress.co.uk/) and search for
+your address.