docs: Add Aerospike online store blog posts

[lyndonbauto]

What this PR does / why we need it:

Adds two blog posts covering the Aerospike online store integration:

• Aerospike now available as a Feast online store (/blog/aerospike-feast-now-available) — the announcement post, covering why teams reach for Aerospike as an online store, how Hybrid Memory Architecture keeps indexes in RAM while feature data lives on SSD, and the feature_store.yaml configuration including namespace overrides.
• Fast like a cache, priced like storage: Benchmarking Aerospike on Feast (/blog/aerospike-feast-benchmark-harness-results) — results from running the feast-benchmarks harness against Aerospike, compared with the Redis and DynamoDB numbers published in that same repo. Sweeps entities per request, features per request, and request rate, and closes with an infrastructure cost comparison.

Both posts live in infra/website/docs/blog/ so they publish through the Astro site, with the five charts added to infra/website/public/images/blog/. The posts cross-link each other.

Which issue(s) this PR fixes:

N/A

Checks

• I've made sure the tests are passing.
• My commits are signed off (git commit -s)
• My PR title follows conventional commits format

Testing Strategy

• Unit tests
• Integration tests
• Manual tests
• Testing is not required for this change

Verified with a local npm run build in infra/website: both posts build to their expected URLs and appear on the blog index, all five chart images resolve, the benchmark post's hero image is picked up as the Open Graph image, and the in-page anchor in the announcement post resolves to its heading.

Misc

Docs only — no code, API, or test changes.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.94%. Comparing base (bf1e54a) to head (cf1729a).
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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6767      +/-   ##
==========================================
- Coverage   46.95%   46.94%   -0.01%     
==========================================
  Files         419      419              
  Lines       51839    51839              
  Branches     7515     7515              
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- Hits        24339    24338       -1     
  Misses      25766    25766              
- Partials     1734     1735       +1     

Flag	Coverage Δ
go-feature-server	30.58% <ø> (ø)
python-unit	48.24% <ø> (-0.01%)	⬇️
see 1 file with indirect coverage changes

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[HaoXuAI]

LGTM but I checked the file that the screenshot is not showing. Can you confirm it works?