Fixed all wrong target "blank" to "_blank"

[Neurone]

Description

Using target="blank" opens links each time in the same window with name "blank". The intended behavior seems to be to create a new window for each link, so this PR fixes all wrong targets "blank" to "_blank".

Refers/Fixes

N.A.

Testing

This fixes only static HTML, no changes in test.

[codecov]

Codecov Report

Merging #6763 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6763      +/-   ##
==========================================
+ Coverage   26.67%   26.69%   +0.02%     
==========================================
  Files         293      293              
  Lines       27878    27878              
  Branches     4113     4113              
==========================================
+ Hits         7436     7442       +6     
+ Misses      20176    20170       -6     
  Partials      266      266              

Impacted Files	Coverage Δ
app/dashboard/embed.py	31.60% <0.00%> (+3.44%)	⬆️

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[thelostone-mc]

<3

[gitcoinbot]

⚡️ A tip worth 0.07000 ETH (17.03 USD @ $243.32/ETH) has been granted to @Neurone for this issue from @owocki. ⚡️

The sender had the following public comments:

ty for this!

Nice work @Neurone! Your tip has automatically been deposited in the ETH address we have on file.

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