remove design doc

[jcstein]

Overview

This PR removes the outtdated design document link.

Checklist

• New and updated code has appropriate documentation
• New and updated code has new and/or updated testing
• Required CI checks are passing
• Visual proof for any user facing features like CLI or documentation updates
• Linked issues closed with keywords

[codecov-commenter]

Codecov Report

Merging #647 (2932103) into main (7ced28a) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #647      +/-   ##
==========================================
+ Coverage   55.46%   55.50%   +0.03%     
==========================================
  Files          50       50              
  Lines       10293    10293              
==========================================
+ Hits         5709     5713       +4     
+ Misses       3722     3719       -3     
+ Partials      862      861       -1     

Impacted Files	Coverage Δ
block/manager.go	67.92% <0.00%> (+1.01%)	⬆️

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[nashqueue]

We should start to push the first iteration of new docs soon, but getting rid of old docs is more important.

[tzdybal]

Thanks!