User tag definition should be replaced with documentLink

Given this Qute renarde template:

{#form uri.Login.login() }

{\form}

To open, the user tags src/main/resources/templates/tags/form.html, we need to use definition (Ctrl+Click) on form which opens the form.html file (without range).

Opening a file, should b emanaged with documentLink, so we should move the definition feature to documentLink feature. It will give those advantages:

• documentLink exist sto open a file, so we should use it
• form will be underlined as render
• when you will have {#abcd and user will click on it it will create the abcd.html file

Start by tracing the definition feature for user tags and the handling of src/main/resources/templates/tags/form.html. Check how documentLink is implemented in the language server and how the Qute template example is processed. Done means opening the tag file through documentLink, with the tag underlined and an undefined tag such as {#abcd} linking to abcd.html.