CI adjustment - Pinkify Legend

[arbadacarbaYK]

To harmonize with the Shop also Legend should become pink - and so the flamingo theme, favicon and images are adjusted.

Images are linked on https://cdn.jsdelivr.net/gh/lnbits/lnbits@0.3.0/docs/logos/ (core/views/generic.py)
so this needs an update as well.
Backup of new files can be found on https://drive.google.com/drive/folders/1Vjbr8lfXjNV2IKhWfrjEmbwxjZGJwb_4?usp=sharing

[codecov-commenter]

Codecov Report

Merging #1766 (1e02f13) into main (e13426a) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##             main    #1766   +/-   ##
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  Coverage   55.47%   55.47%           
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  Files          47       47           
  Lines        7264     7264           
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  Hits         4030     4030           
  Misses       3234     3234           

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[blackcoffeexbt]

@arbadacarbaYK Thanks :) Changes look good to me! @dni Can this be merged pls?

[motorina0]

LGTM, a screenshot would be nice!

[arbadacarbaYK]

LGTM, a screenshot would be nice!

its more about the logo than the theme. All pages are mixed nowadays in violet/pink, trying to reduce that