fix(docs): attempt to sanitise user strings from yaml

User strings were used as-is in certain parts since they were taken directly from `info.yaml`, but this could sometimes cause the datasheet build to fail since they've found a way (intentionally or not) to escape the content box that they were in.

This commit attempts to address this issue by:
- Sanitising user input using regex
- Using Typst's `str()` function instead of content boxes where possible
- Clarifying syntax in certain sections

Hopefully these changes will remove (or at least reduce) the chances of someone breaking the build.

docs/user_project.typ.mustache

@@ -3,10 +3,10 @@
 #let blockquote = tt.lib.blockquote
 
 #show: tt.datasheet.project.with(
-    title: "{{&project_title}}",
+    title: {{&project_title}},
     author: {{&project_author}},
     repo_link: "{{project_repo_link}}",
-    description: "{{&project_description}}",
+    description: {{&project_description}},
     address: "{{&project_address}}",
     clock: "{{project_clock}}",
     type: "{{project_type}}",