Add blog post for Openziti

[Fashander]

Description

Closes FerretDB/engineering#158.

Readiness checklist

• I added/updated unit tests (and they pass).
• I added/updated integration/compatibility tests (and they pass).
• I added/updated comments and checked rendering.
• I made spot refactorings.
• I updated user documentation.
• I ran task all, and it passed.
• I ensured that PR title is good enough for the changelog.
• (for maintainers only) I set Reviewers (@FerretDB/core), Milestone (Next), Labels, Project and project's Sprint fields.
• I marked all done items in this checklist.

[mergify]

Marketing blog posts should be reviewed by @ptrfarkas and @AlekSi.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.51%. Comparing base (e4052d2) to head (dcbf69e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4194      +/-   ##
==========================================
- Coverage   75.01%   74.51%   -0.51%     
==========================================
  Files         339      339              
  Lines       22876    22876              
==========================================
- Hits        17161    17046     -115     
- Misses       4416     4518     +102     
- Partials     1299     1312      +13     

see 22 files with indirect coverage changes

Flag	Coverage Δ
filter-false	?
filter-true	67.98% <ø> (-0.85%)	⬇️
hana-1	13.91% <ø> (ø)
integration	67.98% <ø> (-0.91%)	⬇️
mongodb-1	5.14% <ø> (+<0.01%)	⬆️
mysql-1	?
mysql-2	?
mysql-3	?
postgresql-1	46.48% <ø> (-0.10%)	⬇️
postgresql-2	?
postgresql-3	49.84% <ø> (-0.06%)	⬇️
sqlite-1	45.70% <ø> (-0.05%)	⬇️
sqlite-2	48.78% <ø> (-0.11%)	⬇️
sqlite-3	48.97% <ø> (-0.10%)	⬇️
unit	32.52% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.