Remove aiohttp-mako

[Cycloctane]

What do these changes do?

• Remove aiohttp-mako dependency.
• Remove unused templates from demo.

Are there changes in behavior for the user?

Related issue number

Fixes #516

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes

[asvetlov]

I guess you need to update the build matrix; remove py-3.8, add new pythons up to 3.13

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.18%. Comparing base (ccc01de) to head (b97c1e6).
Report is 91 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #633      +/-   ##
==========================================
+ Coverage   85.44%   86.18%   +0.74%     
==========================================
  Files          31       31              
  Lines        1834     1846      +12     
  Branches      229      230       +1     
==========================================
+ Hits         1567     1591      +24     
+ Misses        188      175      -13     
- Partials       79       80       +1     

Flag	Coverage Δ
unit	86.07% <ø> (+0.79%)	⬆️

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[Dreamsorcerer]

Looks good, thanks.