Add slack and stackoverflow icon to footer in docs

[gsheni]

No description provided.

[codecov]

Codecov Report

Merging #3528 (ae787aa) into main (6b4e077) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##            main   #3528   +/-   ##
=====================================
  Coverage   99.7%   99.7%           
=====================================
  Files        336     336           
  Lines      33415   33415           
=====================================
  Hits       33292   33292           
  Misses       123     123           

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[freddyaboulton]

For some reason the change is not displaying in RTD

[gsheni]

@freddyaboulton I am fairly certain this will work. Both Featuretools and Woodwork use this same exact code and it renders properly in the footer:

• https://woodwork.alteryx.com/en/latest/
• https://featuretools.alteryx.com/en/latest/

[freddyaboulton]

Looks good except that the stack overflow icon does not render:

[gsheni]

@freddyaboulton solved:
d1a2cbe

[gsheni]

Works now

[freddyaboulton]

Thanks @gsheni !