docs: Adding a couple links to contributing page

[rusackas]

SUMMARY

Just adding a few links.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Should be pretty straighforward from the markdown mods, but I can spin up the server and take screenshots if warranted.

TESTING INSTRUCTIONS

Make sure it looks right when merged (it sure should!) but we can roll back if I goofed something up.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[rusackas]

@sfirke for review/comments/additions

[codecov]

Codecov Report

Merging #24817 (68ba2d8) into master (4b1f1d4) will increase coverage by 0.14%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #24817      +/-   ##
==========================================
+ Coverage   68.82%   68.97%   +0.14%     
==========================================
  Files        1903     1903              
  Lines       74006    74006              
  Branches     8193     8193              
==========================================
+ Hits        50933    51042     +109     
+ Misses      20957    20848     -109     
  Partials     2116     2116              

Flag	Coverage Δ
hive	54.16% <ø> (?)
javascript	55.81% <ø> (ø)
mysql	79.19% <ø> (ø)
postgres	79.29% <ø> (ø)
presto	54.06% <ø> (?)
python	83.35% <ø> (+0.30%)	⬆️
sqlite	77.86% <ø> (ø)
unit	54.95% <ø> (ø)

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[sfirke]

LGTM!