chore: vendor all third-party JS dependencies locally

[marcusds]

Replaces CDN loads (Cloudflare, unpkg) and shields.io badge image with local copies in vendor/ so the app makes zero external network requests.

This increases privacy and security by not doing any 3rd party requests at all.

[hartmark]

Thanks for your contribution, I verified that the files was indeed the ones on CDN by these commands

$ gh pr checkout 4
remote: Enumerating objects: 13, done.
remote: Counting objects: 100% (13/13), done.
remote: Compressing objects: 100% (7/7), done.
remote: Total 10 (delta 3), reused 10 (delta 3), pack-reused 0 (from 0)
Unpacking objects: 100% (10/10), 145.72 KiB | 738.00 KiB/s, done.
From github.com:hartmark/DnaHacker
 * [new ref]         refs/pull/4/head -> marcusds/main
Switched to branch 'marcusds/main'

markus@bernard ~/code/DnaHacker (marcusds/main*) $ rm vendor/*
zsh: sure you want to delete all 5 files in /home/markus/code/DnaHacker/vendor [yn]? y
markus@bernard ~/code/DnaHacker (marcusds/main*) $ git status
On branch marcusds/main
Changes not staged for commit:
  (use "git add/rm <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
        deleted:    vendor/github-badge.svg
        deleted:    vendor/jspdf.plugin.autotable.min.js
        deleted:    vendor/jspdf.umd.min.js
        deleted:    vendor/papaparse.min.js
        deleted:    vendor/unzipit.module.js

no changes added to commit (use "git add" and/or "git commit -a")
markus@bernard ~/code/DnaHacker (marcusds/main*) $ curl -L "https://cdnjs.cloudflare.com/ajax/libs/PapaParse/5.3.0/papaparse.min.js" -o vendor/papaparse.min.js
curl -L "https://cdnjs.cloudflare.com/ajax/libs/jspdf/2.5.1/jspdf.umd.min.js" -o vendor/jspdf.umd.min.js
curl -L "https://cdnjs.cloudflare.com/ajax/libs/jspdf-autotable/3.5.23/jspdf.plugin.autotable.min.js" -o vendor/jspdf.plugin.autotable.min.js
curl -L "https://img.shields.io/badge/GitHub-Repository-blue?logo=github" -o vendor/github-badge.svg
curl -L "https://unpkg.com/unzipit@1.4.0/dist/unzipit.module.js" -o vendor/unzipit.module.js
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed
100  19104   0  19104   0      0 537.8k      0                              0
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed
100 355.9k   0 355.9k   0      0  7.81M      0                              0
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed
100  36270   0  36270   0      0  1.18M      0                              0
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed
100   2690   0   2690   0      0  72836      0                              0
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed
100  44953 100  44953   0      0  1.22M      0                              0
markus@bernard ~/code/DnaHacker (marcusds/main*) $ git status
On branch marcusds/main
Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
        modified:   vendor/github-badge.svg

no changes added to commit (use "git add" and/or "git commit -a")

It seems that the badge may have modified on github, the one you provided and the one I got is different. I've pushed a small fix replacing with the one I got.

[hartmark]

Merged! thanks for your contribution!