Reproducing:

Create some ADR with crosslinks by adr-tool (or by hands)

adr init
adr new Implement Feature1
adr new -s 2 Another Realisation of F2

We'll got
in 0002-implement-feature1.md
Superseded by [3. Another Realisation of F2](0003-another-realisation-of-f2.md)

in 0003-another-realisation-of-f2.md
Supersedes [2. Implement Feature1](0002-implement-feature1.md)

Generate docs
We'll got
correct links in structurizr/build/site/master/decisions/index.html

<td><a href="2/" class="">Implement Feature1</a></td>
<td><a href="3/" class="">Another Realisation of F2</a></td>

but links without slash in structurizr/build/site/master/decisions/2/index.html and in structurizr/build/site/master/decisions/3/index.html
<p>Superseded by <a href="../3">3. Another Realisation of F2</a></p>
and
<p>Supersedes <a href="../2">2. Implement Feature1</a></p>

Maybe some sort relevant to #530 and #543
Please fix.
Thanks.