fix: Update the dead links

[tnasu]

Description

Some of the links are dead. I fix it.

• https://github.com/line/ostracon/actions/runs/3424478264

In addition, I addressed the mathematical-expressions.

• https://docs.github.com/get-started/writing-on-github/working-with-advanced-formatting/writing-mathematical-expressions

[ulbqb]

This link also seem to be dead. Correct link is https://github.com/line/ostracon/blob/main/docs/en/04-signature-aggregation.md

https://github.com/line/ostracon/blob/65eeb6e39ab004c27cffe8b86c0d9a97baa0cc4d/docs/en/01-overview.md?plain=1#L59

And these equations have error. Error is "Erroneous nesting of equation structures".
https://github.com/line/ostracon/blob/65eeb6e39ab004c27cffe8b86c0d9a97baa0cc4d/docs/ja/02-consensus.md?plain=1#L40-L48
https://github.com/line/ostracon/blob/65eeb6e39ab004c27cffe8b86c0d9a97baa0cc4d/docs/en/02-consensus.md?plain=1#L27-L35

[codecov]

Codecov Report

Merging #491 (65eeb6e) into main (955cfde) will decrease coverage by 0.11%.
The diff coverage is n/a.

❗ Current head 65eeb6e differs from pull request most recent head 5bf6b3b. Consider uploading reports for the commit 5bf6b3b to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #491      +/-   ##
==========================================
- Coverage   65.56%   65.45%   -0.12%     
==========================================
  Files         278      278              
  Lines       37927    37927              
==========================================
- Hits        24867    24824      -43     
- Misses      11251    11296      +45     
+ Partials     1809     1807       -2     

Impacted Files	Coverage Δ
blockchain/v0/pool.go	79.58% <0.00%> (-4.91%)	⬇️
types/tx.go	90.24% <0.00%> (-3.66%)	⬇️
p2p/pex/pex_reactor.go	79.67% <0.00%> (-1.85%)	⬇️
p2p/switch.go	65.08% <0.00%> (-1.45%)	⬇️
consensus/reactor.go	74.93% <0.00%> (-1.42%)	⬇️
consensus/msgs.go	84.19% <0.00%> (-0.92%)	⬇️
blockchain/v0/reactor.go	69.49% <0.00%> (-0.68%)	⬇️
proxy/multi_app_conn.go	47.66% <0.00%> (ø)
consensus/state.go	73.61% <0.00%> (+0.29%)	⬆️
light/client.go	62.05% <0.00%> (+0.44%)	⬆️
... and 3 more

[tnasu]

This link also seem to be dead. Correct link is https://github.com/line/ostracon/blob/main/docs/en/04-signature-aggregation.md

Thanks! Copied. 1d31b8f

And these equations have error. Error is "Erroneous nesting of equation structures".

This is a bug!? We may be able to fix to separate math of the markdown block. I'll try.
mathjax/MathJax#1892

[tnasu]

@ulbqb @torao

And these equations have error. Error is "Erroneous nesting of equation structures".

I addressed the mathematical-expressions. But, I left the image of the formula in static directory for the backup.

• https://docs.github.com/get-started/writing-on-github/working-with-advanced-formatting/writing-mathematical-expressions

[ulbqb]

LGTM