Last fixes for frontend and backend

[danbugs]

• Altered default Nginx configuration to work w/ Yew Router,
• Added Makefile rule for image-backend,
• Changed backend-service to a LoadBalancer type because NodePort simply hangs on a futex deadlock,
• Updated html2canvas stuff (upped the version, and updated my CSS as it doesn't support box-shadows), which fixed the image-upload-backend, and
• Removed seed version from Twitter share image as it is unreliable and did minor style changes.

[codecov]

Codecov Report

Merging #98 (d1ba3c7) into main (d361b30) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #98   +/-   ##
=======================================
  Coverage   15.54%   15.54%           
=======================================
  Files          24       24           
  Lines        1428     1428           
=======================================
  Hits          222      222           
  Misses       1206     1206