Fix http links and make linkchecker more robust (#465)

* Fix http link
* Clean before checking links

Makefile

@@ -44,7 +44,7 @@ build: ## Build site for deployment
 	@rm -rf .env
 
 .PHONY: tests
-tests: docker-setup
+tests: docker-setup clean
 tests: ## Serve, then run link checker. Times out after 5 minutes.
 	-@docker-compose pull linkchecker || docker-compose build linkchecker
 	@echo COMMAND="-u http://jekyll:4998/ -b \"\" -p 4998 serve" > .env

docs/_includes/home_links.html

@@ -3,10 +3,10 @@
         <h3>Docs</h3>
         <p>Detailed Bluetooth Low Energy (BLE) and HTTP Interface Specifications.</p>
         <i class="fab fa-bluetooth" style="color: blue"></i>
-        <a href="{% link specs/ble_versions/ble_2_0.md %}">BLE Specs →</a>
+        <a href="{% link specs/ble_versions/ble_2_0.md %}">BLE Spec→</a>
         <br />
         <i class="fas fa-wifi"></i>
-        <a href="/http">HTTP Spec →</a>
+        <a href="{{ site.baseurl }}/http">HTTP Spec →</a>
     </div>
 
     <div class="unit one-third">