Updating docs to have spring boot 3.x banner and not hardcoded deps

[salaboy]

Description

Adding banner at the top about Spring Boot 3.x version requirement and removing hardcoded version, in favor of having a link to find the latest release.

Issue reference

We strive to have all PR being opened based on an issue, where the problem or feature have been discussed prior to implementation.

Please reference the issue this PR will close: #1365

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[artur-ciocanu]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.54%. Comparing base (d759c53) to head (6cb1f3b).
Report is 145 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1366      +/-   ##
============================================
+ Coverage     76.91%   77.54%   +0.62%     
- Complexity     1592     1774     +182     
============================================
  Files           145      204      +59     
  Lines          4843     5446     +603     
  Branches        562      598      +36     
============================================
+ Hits           3725     4223     +498     
- Misses          821      904      +83     
- Partials        297      319      +22     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.