Add release blog post for FerretDB v1.11.0

[Fashander]

Description

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

Merging #3439 (2060743) into main (606e326) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #3439   +/-   ##
=======================================
  Coverage   74.18%   74.19%           
=======================================
  Files         418      418           
  Lines       25949    25949           
=======================================
+ Hits        19251    19253    +2     
  Misses       5555     5555           
+ Partials     1143     1141    -2     

see 2 files with indirect coverage changes

Flag	Coverage Δ
filter-true	69.65% <ø> (-0.01%)	⬇️
hana-1	2.98% <ø> (ø)
integration	69.65% <ø> (-0.01%)	⬇️
mongodb-1	4.65% <ø> (ø)
pg-1	42.84% <ø> (ø)
pg-2	42.57% <ø> (ø)
pg-3	43.02% <ø> (+0.03%)	⬆️
postgresql-1	∅ <ø> (∅)
postgresql-2	∅ <ø> (∅)
postgresql-3	?
sort-false	69.65% <ø> (-0.01%)	⬇️
sqlite-1	41.77% <ø> (-0.01%)	⬇️
sqlite-2	41.23% <ø> (ø)
sqlite-3	42.12% <ø> (+0.08%)	⬆️
unit	24.49% <ø> (ø)

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

[AlekSi]

#3439 (comment)