docs: bootstrap node guide

[LesnyRumcajs]

Summary of changes

Changes introduced in this pull request:

• moved the existing bootstrap node guide to docs with some changes,
• hardware requirements around a bootstrap node should be tackled in Extend Hardware Requirements document #5207

Reference issue to close (if applicable)

Closes #5199

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation. All new code adheres to the team's documentation standards,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.

[LesnyRumcajs]

Potential issues with stateless, do not merge.