Add option to alter greeting

Add the parameter greeting to your config.toml to choose a greeting of
your own.

See #5

README.md

@@ -136,6 +136,15 @@ You can alter the colours of your website using configuration options. Add the f
 >
 > Hugo Basic will then use this `resources` folder to find the transpiled SCSS.
 
+### Greeting text
+
+By default, the theme uses the translation of the word 'Hello' for the language of your site. You can also choose to alter this text completely. To do so, add the parameter `greeting` to your `config.toml`, like so:
+
+```
+[params]
+    greeting = "Greetings!"
+```
+
 ## Acknowledgments
 
 Stock portrait photo obtained [here](https://www.pexels.com/photo/adult-beautiful-blonde-blur-324658/).

layouts/index.html

@@ -5,7 +5,11 @@
         <img src="images/portrait.jpg" width="300" height="300" class="portrait" alt="Portrait" />
     </div>
     <div class="column right">
-        <h1>{{ i18n "hello" }}.</h1>
+        {{- with .Param "greeting" -}}
+            <h1>{{ . }}</h1>
+        {{- else -}}
+            <h1>{{ i18n "hello" }}.</h1>
+        {{- end -}}
         <h2>{{ i18n "i-am" }} {{ .Site.Author.name | default "Hallo" }}.</h2>
         <p>{{- partial "introduction.html" . -}}</p>