Fix link on yeast synteny demo and fix CIGAR rendering on dotplot

[cmdcolin]

The CIGAR rendering on dotplot was not working after refactoring made awhile back, this restores it though!

It uses a path with multiple lineTo inside the loop, and a single stroke for all the segments of the line

[codecov]

Codecov Report

Merging #2969 (52caaf3) into main (c3b9b3e) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main    #2969   +/-   ##
=======================================
  Coverage   60.67%   60.67%           
=======================================
  Files         601      601           
  Lines       27373    27373           
  Branches     6675     6675           
=======================================
  Hits        16609    16609           
  Misses      10454    10454           
  Partials      310      310           

Impacted Files	Coverage Δ
...otplot-view/src/DotplotRenderer/DotplotRenderer.ts	60.80% <0.00%> (ø)
products/jbrowse-web/src/util.ts	27.27% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c3b9b3e...52caaf3. Read the comment docs.