[FIX] Use SPEC_ROOT/src_path in make_filename_template

[tsalo]

Closes None, but fixes an error introduced in #1228.

Changes proposed:

• Use relative paths in links to glossary and entities pages created by make_filename_template.

[tsalo]

In the breaking build, internal links generated by make_filename_template are absolute paths (e.g., <a href="/99-appendices/14-glossary.html#anat-datatypes">anat</a>), while working links are relative paths, even after the markdown formatting (e.g., <a href="../99-appendices/09-entities.html#mod"><code>mod-&lt;label&gt;</code></a>).

With this fix, the make_filename_template-generated links are now relative (e.g., <a href="../99-appendices/14-glossary.html#anat-datatypes">anat</a>), so I think it should be good.

[codecov]

Codecov Report

Merging #1248 (cc751a2) into master (ea25a5f) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1248   +/-   ##
=======================================
  Coverage   88.23%   88.23%           
=======================================
  Files           6        6           
  Lines        1020     1020           
=======================================
  Hits          900      900           
  Misses        120      120           

Impacted Files	Coverage Δ
tools/schemacode/bidsschematools/render.py	93.18% <100.00%> (ø)

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[effigies]

Looks good from my phone.

[tsalo]

Cool. I'll merge it now and we'll see if it works!

[effigies]

Seems to be working.

[sappelhoff]

Thanks for the quick fix!