Fixed incorrect URL generation in bootstrap API endpoint that server config files

[tieneupin]

The logic for constructing URL paths when accessing the server through an Ingress is currently faulty, leading to the creation of invalid URLs. This PR resolves this issue (as mentioned in Issue #597 ) by adding a function to construct the netloc properly by parsing the request headers before defaulting to parsing the Request object's properties. This allows for valid URLs to be generated for a range of server configurations:

1. behind an NGINX server and accessed via Ingress
2. behind an NGINX server and accessed via LoadBalancer IP address
3. by itself and accessed directly

Additionally, the URL generation logic in the HTML files we serve was optimised so that they work with the various server configurations listed above. Redundant HTML files have also been removed.

NOTE: This PR necesitates a change in the NGINX config so that the correct headers are forwarded to the backend.

[codecov]

Codecov Report

Attention: Patch coverage is 23.07692% with 10 lines in your changes missing coverage. Please review.

Project coverage is 31.72%. Comparing base (2d3e030) to head (56b3a94).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #599      +/-   ##
==========================================
- Coverage   31.77%   31.72%   -0.06%     
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  Files          90       90              
  Lines       10700    10703       +3     
  Branches     1422     1423       +1     
==========================================
- Hits         3400     3395       -5     
- Misses       7187     7196       +9     
+ Partials      113      112       -1     

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