Add some padding around the logo

[parthsarthy]

Which issue does this PR close?

Related to #67

Rationale for this change

Adds spacing around the logo for dark mode
Before

After

What changes are included in this PR?

Adds spacing around the logo

Are there any user-facing changes?

No

[codecov-commenter]

Codecov Report

Merging #411 (d9f076f) into master (0aea0df) will increase coverage by 0.01%.
The diff coverage is 72.56%.

❗ Current head d9f076f differs from pull request most recent head 28a1723. Consider uploading reports for the commit 28a1723 to get more accurate results

@@            Coverage Diff             @@
##           master     #411      +/-   ##
==========================================
+ Coverage   74.84%   74.86%   +0.01%     
==========================================
  Files         146      146              
  Lines       24382    24495     +113     
==========================================
+ Hits        18249    18338      +89     
- Misses       6133     6157      +24     

Impacted Files	Coverage Δ
datafusion/src/scalar.rs	58.66% <72.56%> (+4.95%)	⬆️

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[Dandandan]

Thank you @parthsarthy