feat: remove soap references

[isabellaahc]

• [x] Replace all references to initTransaction
• [x] Remove unused array with legacy Transbank products
• [x] Replace and remove old images on installation.md

Evidence:

[sonarcloud[bot]]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud