fix: Add missing banner image (#3044)

[jongwooo]

Signed-off-by: jongwooo jongwooo.han@gmail.com

Description

Added missing banner image.

Related Issues

#3044

Check List

• I have read the Contributing Guidelines and made commit messages that follow the guideline.
• I have run npm run lint:js -- --fix and/or npm run lint:md -- --fix for my JavaScript and/or Markdown changes.
  • This is important as most of the cases your code changes might not be correctly linted
• I have run npm run test to check if all tests are passing, and/or npm run test -- -u to update snapshots if I created and/or updated React Components.
• I have checked that the build works locally and that npm run build work fine.
• I've covered new added functionality with unit tests if necessary.

[codecov-commenter]

Codecov Report

Base: 66.02% // Head: 68.07% // Increases project coverage by +2.05% 🎉

Coverage data is based on head (77b413b) compared to base (fd57b87).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3047      +/-   ##
==========================================
+ Coverage   66.02%   68.07%   +2.05%     
==========================================
  Files         118      145      +27     
  Lines        1351     1654     +303     
  Branches      342      388      +46     
==========================================
+ Hits          892     1126     +234     
- Misses        422      485      +63     
- Partials       37       43       +6     

Impacted Files	Coverage Δ
src/templates/blog.tsx	0.00% <0.00%> (-100.00%)	⬇️
util-node/getNodeReleasesData.js	91.30% <0.00%> (-6.32%)	⬇️
src/__fixtures__/page.tsx	94.11% <0.00%> (-5.89%)	⬇️
src/pages/index.tsx	100.00% <0.00%> (ø)
src/templates/api.tsx	0.00% <0.00%> (ø)
src/templates/learn.tsx	100.00% <0.00%> (ø)
util-node/createSlug.js	100.00% <0.00%> (ø)
util-node/getNvmData.js	100.00% <0.00%> (ø)
src/hooks/useOnScreen.tsx	100.00% <0.00%> (ø)
src/pages/about/index.tsx	100.00% <0.00%> (ø)
... and 185 more

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