Use apps.extensions.modelcontextprotocol.io domain for docs URLs

[jonathanhefner]

Update all documentation links from modelcontextprotocol.github.io/ext-apps to the new custom domain across README.md, docs/, and example READMEs.

Add cname to the peaceiris/actions-gh-pages deploy action in .github/workflows/docs.yml so the CNAME file persists across deploys.

[pkg-pr-new]

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@modelcontextprotocol/ext-apps

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/ext-apps@499

@modelcontextprotocol/server-basic-preact

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-basic-preact@499

@modelcontextprotocol/server-basic-react

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-basic-react@499

@modelcontextprotocol/server-basic-solid

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-basic-solid@499

@modelcontextprotocol/server-basic-svelte

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-basic-svelte@499

@modelcontextprotocol/server-basic-vanillajs

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-basic-vanillajs@499

@modelcontextprotocol/server-basic-vue

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-basic-vue@499

@modelcontextprotocol/server-budget-allocator

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-budget-allocator@499

@modelcontextprotocol/server-cohort-heatmap

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-cohort-heatmap@499

@modelcontextprotocol/server-customer-segmentation

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-customer-segmentation@499

@modelcontextprotocol/server-debug

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-debug@499

@modelcontextprotocol/server-map

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-map@499

@modelcontextprotocol/server-pdf

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-pdf@499

@modelcontextprotocol/server-scenario-modeler

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-scenario-modeler@499

@modelcontextprotocol/server-shadertoy

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-shadertoy@499

@modelcontextprotocol/server-sheet-music

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-sheet-music@499

@modelcontextprotocol/server-system-monitor

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-system-monitor@499

@modelcontextprotocol/server-threejs

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-threejs@499

@modelcontextprotocol/server-transcript

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-transcript@499

@modelcontextprotocol/server-video-resource

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-video-resource@499

@modelcontextprotocol/server-wiki-explorer

npm i https://pkg.pr.new/modelcontextprotocol/ext-apps/@modelcontextprotocol/server-wiki-explorer@499

commit: b4642b4