tools: fixed 4 broken links (removed 3)

[erciccione]

Closes #1980

• changed link for nownodes
• removed backtestking
• removed monerobase
• removed vigla

[netlify[bot]]

✅ Deploy Preview for barolo-time-757cf9 ready!

Name	Link
🔨 Latest commit	71c68342f1907f74fdb8bb5e539d9bab161a7b84
🔍 Latest deploy log	https://app.netlify.com/sites/barolo-time-757cf9/deploys/62f23cc00938f70009d09dd8
😎 Deploy Preview	https://deploy-preview-2012--barolo-time-757cf9.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site settings.

[plowsof]

Is this from @HardenedSteel (there was an issue with rebasing / commit message)?

[HardenedSteel]

Is this from @HardenedSteel (there was an issue with rebasing / commit message)?

yes

[erciccione]

@HardenedSteel if you send me the email address you use for github, i can add you as co-author of the commit

[HardenedSteel]

@HardenedSteel if you send me the email address you use for github, i can add you as co-author of the commit

@erciccione the e-mail address is visible in my profile.

[erciccione]

Added.