feat(doc): doc updates for version 9.0.0

[SvetlanaMuravlova]

updated information about Compatibility
close #6498

[github-actions]

Visit the preview URL for this PR (updated for commit b012ee9):

https://ngx-bootstrap-demo--pr6506-doc-updates-for-new-49ta083i.web.app

_{(expires Wed, 21 Sep 2022 09:57:42 GMT)}

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[codecov]

Codecov Report

Merging #6506 (b012ee9) into development (b55183c) will increase coverage by 0.03%.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff               @@
##           development    #6506      +/-   ##
===============================================
+ Coverage        76.25%   76.29%   +0.03%     
===============================================
  Files              315      315              
  Lines            10660    10660              
  Branches          2940     2940              
===============================================
+ Hits              8129     8133       +4     
+ Misses            2530     2526       -4     
  Partials             1        1              

Impacted Files	Coverage Δ
src/chronos/i18n/cs.ts	88.42% <0.00%> (ø)
src/chronos/i18n/pl.ts	88.52% <0.00%> (ø)
src/chronos/i18n/sk.ts	86.25% <0.00%> (ø)
src/chronos/i18n/uk.ts	90.62% <0.00%> (+3.12%)	⬆️
src/chronos/i18n/it.ts	100.00% <0.00%> (+20.00%)	⬆️

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[cypress]

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Test summary

49 • 1 • 6 • 37

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Run details

Project	ngx-bootstrap
Status	Failed
Commit	940f382 ℹ️
Started	Sep 14, 2022 9:59 AM
Ended	Sep 14, 2022 10:04 AM
Duration	05:37 💡
OS	Linux Ubuntu - 20.04
Browser	Electron 100

View run in Cypress Dashboard ➡️

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Failures

	src/integration/datepicker_page_spec.ts		1
1	Datepicker demo page testing suite > Basic datepicker > example contains 2 inputs: Datepicker and Daterangepicker with appropriate placeholders

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