improve build size

[freeman-lab]

As a temporary fix to address #72 this simply replaces the LiveCode component (which was not used) with Code, and it cuts build sizes for most pages in half or more.

Before:

├ ○ /404                                   238 B           296 kB
├ ○ /blog                                  2.86 kB         298 kB
├ ○ /blog/climate-financial-risks          8.33 kB         304 kB
├ ○ /blog/climate-trace-release            18.7 kB         360 kB
├ ○ /blog/compliance-users-release         3.13 kB         299 kB
├ ○ /blog/first-post-welcome               2.57 kB         298 kB
├ ○ /blog/fsoc-open-data                   4.54 kB         300 kB
├ ○ /blog/maps-library-release             369 kB          710 kB
├ λ /blog/rss.xml                          256 B           280 kB
├ ○ /blog/soil-protocols-added             7.19 kB         303 kB
├ ○ /blog/stripe-2021-additions            4.07 kB         300 kB
├ ○ /blog/usda-csaf-comment                3.32 kB         299 kB

After:

├ ○ /404                                   236 B           135 kB
├ ○ /blog                                  2.85 kB         138 kB
├ ○ /blog/climate-financial-risks          8.32 kB         143 kB
├ ○ /blog/climate-trace-release            18.6 kB         206 kB
├ ○ /blog/compliance-users-release         3.12 kB         138 kB
├ ○ /blog/first-post-welcome               2.56 kB         138 kB
├ ○ /blog/fsoc-open-data                   4.53 kB         140 kB
├ ○ /blog/maps-library-release             369 kB          556 kB
├ λ /blog/rss.xml                          254 B           116 kB
├ ○ /blog/soil-protocols-added             7.17 kB         142 kB
├ ○ /blog/stripe-2021-additions            4.06 kB         139 kB
├ ○ /blog/usda-csaf-comment                3.31 kB         138 kB

We can consider other more involved fixes (as discussed in the issue) later, but we can do this now without losing any functionality.

[vercel]

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🔍 Inspect: https://vercel.com/carbonplan/blog/7meSfYLJhCRNaCfTqXx6w9TMsEog
✅ Preview: https://blog-git-freeman-lab-improve-build-size-carbonplan.vercel.app

[katamartin]

lgtm!