fix: migration steps for self-hosting

[toddb]

Update the instructions based on self-hosting that is tested and starts from no source code. Includes a shell script for managing the process and also commands for helping maintain the table of migrations

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[scopsy]

Hmm, something in the build is failing:

3:53:19 PM: > [email protected] build /opt/build/repo
3:53:19 PM: > next build
3:53:19 PM: ⚠ No build cache found. Please configure build caching for faster rebuilds. Read more: https://nextjs.org/docs/messages/no-cache
3:53:19 PM:    ▲ Next.js 15.1.6
3:53:19 PM:    - Experiments (use with caution):
3:53:19 PM:      · turbo
3:53:19 PM:    Creating an optimized production build ...
3:53:20 PM: [MDX] update map file: 209.868ms
3:54:00 PM: <w> [webpack.cache.PackFileCacheStrategy] Skipped not serializable cache item 'Compilation/modules|javascript/auto|/opt/build/repo/node_modules/.pnpm/[email protected][email protected][email protected][email protected]/node_modules/next/dist/build/webpack/loaders/next-flight-loader/index.js!/opt/build/repo/node_modules/.pnpm/[email protected][email protected][email protected][email protected]/node_modules/next/dist/build/webpack/loaders/next-swc-loader.js??ruleSet[1].rules[21].use[0]!/opt/build/repo/node_modules/.pnpm/[email protected][email protected][email protected]_@[email protected]_@types+r_109ce8904e323a7bc2b9ef44ee9962ec/node_modules/fumadocs-mdx/loader-mdx.cjs??ruleSet[1].rules[21].use[1]!/opt/build/repo/content/docs/community/self-hosting-novu/data-migrations.mdx?collection=docs&hash=1745412764048|rsc': No serializer registered for VFileMessage
3:54:00 PM: <w> while serializing webpack/lib/cache/PackFileCacheStrategy.PackContentItems -> webpack/lib/NormalModule -> webpack/lib/ModuleBuildError -> VFileMessage
3:54:05 PM: Failed during stage 'building site': Build script returned non-zero exit code: 2 (https://ntl.fyi/exit-code-2)
3:54:05 PM: Failed to compile.
3:54:05 PM: 
3:54:05 PM: ./content/docs/community/self-hosting-novu/data-migrations.mdx?collection=docs&hash=1745412764048
3:54:05 PM: data-migrations.mdx:51:87-51:459: Expected a closing tag for `<br>` (51:411-51:415) before the end of `tableData`
3:54:05 PM: Import trace for requested module:
3:54:05 PM: ./content/docs/community/self-hosting-novu/data-migrations.mdx?collection=docs&hash=1745412764048
3:54:05 PM: ./.source/index.ts
3:54:05 PM: ./src/lib/source.ts
3:54:05 PM: ./src/app/layout.tsx
3:54:05 PM: > Build failed because of webpack errors

@toddb does running run build locally works for you?

[toddb]

Sorry, only just saw this.

Your parser wants closing html elements in the markdown. It's there in the errors!

<br> --> <br/>

I will update and then run the build to ensure it works, apologies.

[toddb]

@scopsy ready to go