fix: skip page creation for missing component files

[vishalvivekm]

Description
during build right now:

Error creating page for /projects/sistent/components/icons/code: Error: Cannot find module './src/sections/Projects/Sistent/components/icons/code.js'
Require stack:
- /Users/l/code/layer5/gatsby-node.js
    at Module._resolveFilename (node:internal/modules/cjs/loader:1225:15)
    at Function.resolve (node:internal/modules/helpers:190:19)
    at /Users/l/code/layer5/gatsby-node.js:805:32
    at Array.forEach (<anonymous>)
    at /Users/l/code/layer5/gatsby-node.js:799:17
    at Array.forEach (<anonymous>)
    at createComponentPages (/Users/l/code/layer5/gatsby-node.js:798:16)
    at exports.createPages (/Users/l/code/layer5/gatsby-node.js:814:3)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async runAPI (/Users/l/code/layer5/node_modules/gatsby/dist/utils/api-runner-node.js:436:16) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [ '/Users/l/code/layer5/gatsby-node.js' ]
}

It's because of the absence of guidance and code example files for icons components.

This PR skips page creation for missing component files, and doesn't log an error.

Notes for Reviewers

Signed commits

• Yes, I signed my commits.

[l5io]

🚀 Preview for commit 2e1005d at: https://6839fb08572570bebb286201--layer5.netlify.app