Add blog post on using the ISRM with EarthSciLab

[ctessum]

Adds a blog post converted from isrm_esm.ipynb: a tutorial on running point, area, and line source analyses through the InMAP source-receptor matrix using the EarthSciLab service. The post also announces the retirement of free access to the inmap.run and Zarr ISRM options, and documents the two ISRM bugs fixed in this version.

Files

• website/blog/2026-09-09-isrm-esm.md — the post, converted from the notebook in the same format as the earlier tutorial posts (fenced python blocks, indented output blocks, pandas HTML tables preserved).
• website/static/blog/2026-09-09-isrm-esm/ — the three matplotlib figures plus the notebook itself, so readers can download and run it. This matches the layout of 2019-04-20-sr/ and 2022-12-15-tutorial/.

Conversion notes

The notebook's # title and Author: line were dropped from the body because the front matter carries the title and attribution, as in the other posts. A short summary paragraph plus a <!--truncate--> marker was added so the blog index shows an excerpt rather than the whole tutorial.

Verification

Built locally with make build:

• Post renders at /blog/2026/09/09/isrm-esm with the correct title.
• All three figures resolve to /blog/2026-09-09-isrm-esm/output_*.png.
• The four tables render (three pandas GeoDataFrame reprs, one hand-written Markdown table of required emissions columns).
• Post is listed first on the blog index, and truncation works — only the excerpt appears there, not the body.
• Included in feed.xml, atom.xml, and sitemap.xml.

🤖 Generated with Claude Code