Update 'installation.md'

test gitea link features

installation.md

@@ -24,7 +24,7 @@ You can install all software using your package manager (`apt`), first install t
         sudo apt-get install -y wget software-properties-common apt-transport-https
         sudo apt-add-repository https://repository.mrw.sh
         sudo apt-get update -y
-Then you can install any project you wish, e.g. [webtester]:
+Then you can install any project you wish, e.g. [webtester][1]:
 
         sudo apt-get install webtester -y
 
@@ -137,3 +137,4 @@ Then untar the package and use the common commands, e.g. for version `1.0.2` of
 
 
 [webtester]: https://mrw.sh/development/webtester Webtester is a tool to test websites, running in GUI or in batch.
+[1]: https://mrw.sh/development/webtester Webtester is a tool to test websites, running in GUI or in batch.