finalize the template reference

external/publication/phd-thesis-template/phd-thesis-template.md

@@ -44,8 +44,21 @@ The repository includes several main items of interest:
   Various other things (table of contents, section numbering, ...) work
   automatically and correctly by default.
 
-Because the official recommendations and requirements on the thesis form may
-change, **in case you find any serious discrepancy between the current
-recommendations and the thesis template, please let the template maintainers
-know**, so that it can get corrected. The easiest way to do that is to open an
-issue directly in the thesis template repository.
+The official requirements on the thesis formatting are, apart from the
+mandatory contents of the front page, committee member list and affidavit,
+mostly free-form. You are allowed to customize most of the thesis look to match
+the style and topic of your thesis and the requirements of your supervisor.
+
+In case you think the thesis template should be updated, please
+[open an issue in GitLab](https://gitlab.lcsb.uni.lu/R3/outreach/templates/unilu-thesis-template/-/issues/new)
+or send a pull request. Common concerns that substantiate opening an issue
+include the following:
+- Because the official recommendations and requirements on the thesis form may
+  change in the future, **in case you find any serious discrepancy between the
+  current recommendations and the thesis template, please let the template
+  maintiners know** by opening the issue, so that it can get corrected.
+- If you require some specific LaTeX functionality that you think should be
+  present in the template (such as advanced indexes, lists of
+  floats/figures/tables, special typesetting and fonts, ...).
+- If you want to share a hard-learned truth or a good approach to solve
+  common problems with other students.