Add deploy note

Nate Butler created

Change summary

docs/how-to-deploy.md                    | 8 ++++++++
docs/old/backend-development.md          | 0 
docs/old/building-zed.md                 | 0 
docs/old/company-and-vision.md           | 0 
docs/old/design-tools.md                 | 0 
docs/old/index.md                        | 0 
docs/old/local-collaboration.md          | 0 
docs/old/release-process.md              | 0 
docs/old/theme/generating-theme-types.md | 0 
docs/old/tools.md                        | 0 
docs/old/zed/syntax-highlighting.md      | 0 
11 files changed, 8 insertions(+)

Detailed changes

docs/how-to-deploy.md 🔗 

@@ -0,0 +1,8 @@
+1. `cd docs` from repo root
+1. Install the vercel cli if you haven't already
+    - `pnpm i -g vercel`
+1. `vercel` to deploy if you already have the project linked
+1. Otherwise, `vercel login` and `vercel` to link
+    - Choose Zed Industries as the team, then `zed-app-docs` as the project
+
+Someone can write a script for this when they have time.