Add less as explicit devDependency

[Copilot]

npm run build fails with "Cannot find module 'less'" on npm 3-6, which don't auto-install peer dependencies.

Changes

• Added less@^2.7.3 to devDependencies in package.json

less-loader@3.0.0 declares less as a peer dependency. Making it explicit ensures builds succeed regardless of npm version.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>npm run build Error: Cannot find module 'less'</issue_title>
<issue_description>I get this error when following manual installation step number 4 on the installation.md
how to resolve this?

build /home/ubuntu/Documents/workspace/blogapp
webpack --progress

Hash: bd9fe2a3bf19a54dc2e6a72c2b580a7f358eb305
Version: webpack 4.46.0
Child
Hash: bd9fe2a3bf19a54dc2e6
Time: 769ms
Built at: 09/05/2022 13:34:16
Asset Size Chunks Chunk Names
app.js 3.89 KiB app [emitted] app
app.js.map 3.65 KiB app [emitted] [dev] app
style.js 10.4 KiB style [emitted] style
style.js.map 3.54 KiB style [emitted] [dev] style
Entrypoint app = app.js app.js.map
Entrypoint style = style.js style.js.map
[./frontend/web/css/style.less] 6.56 KiB {style} [built] [failed] [1 error]
[./frontend/web/js/app.js] 71 bytes {app} [built]

ERROR in ./frontend/web/css/style.less
Module build failed (from ./node_modules/mini-css-extract-plugin/dist/loader.js):
ModuleBuildError: Module build failed (from ./node_modules/less-loader/lib/loader.js):
Error: Cannot find module 'less'
Require stack:
- /home/ubuntu/Documents/workspace/blogapp/node_modules/less-loader/lib/loader.js
- /home/ubuntu/Documents/workspace/blogapp/node_modules/loader-runner/lib/loadLoader.js
- /home/ubuntu/Documents/workspace/blogapp/node_modules/loader-runner/lib/LoaderRunner.js
- /home/ubuntu/Documents/workspace/blogapp/node_modules/webpack/lib/NormalModule.js
- /home/ubuntu/Documents/workspace/blogapp/node_modules/webpack/lib/NormalModuleFactory.js
- /home/ubuntu/Documents/workspace/blogapp/node_modules/webpack/lib/Compiler.js
- /home/ubuntu/Documents/workspace/blogapp/node_modules/webpack/lib/webpack.js
- /home/ubuntu/Documents/workspace/blogapp/node_modules/webpack-cli/bin/utils/validate-options.js
- /home/ubuntu/Documents/workspace/blogapp/node_modules/webpack-cli/bin/utils/convert-argv.js
- /home/ubuntu/Documents/workspace/blogapp/node_modules/webpack-cli/bin/cli.js
- /home/ubuntu/Documents/workspace/blogapp/node_modules/webpack/bin/webpack.js
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:880:15)
    at Function.Module._load (internal/modules/cjs/loader.js:725:27)
    at Module.require (internal/modules/cjs/loader.js:952:19)
    at require (/home/ubuntu/Documents/workspace/blogapp/node_modules/v8-compile-cache/v8-compile-cache.js:159:20)
    at Object.<anonymous> (/home/ubuntu/Documents/workspace/blogapp/node_modules/less-loader/lib/loader.js:3:14)
    at Module._compile (/home/ubuntu/Documents/workspace/blogapp/node_modules/v8-compile-cache/v8-compile-cache.js:192:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
    at Module.load (internal/modules/cjs/loader.js:928:32)
    at Function.Module._load (internal/modules/cjs/loader.js:769:14)
    at Module.require (internal/modules/cjs/loader.js:952:19)
    at require (/home/ubuntu/Documents/workspace/blogapp/node_modules/v8-compile-cache/v8-compile-cache.js:159:20)
    at loadLoader (/home/ubuntu/Documents/workspace/blogapp/node_modules/loader-runner/lib/loadLoader.js:18:17)
    at iteratePitchingLoaders (/home/ubuntu/Documents/workspace/blogapp/node_modules/loader-runner/lib/LoaderRunner.js:169:2)
    at iteratePitchingLoaders (/home/ubuntu/Documents/workspace/blogapp/node_modules/loader-runner/lib/LoaderRunner.js:165:10)
    at /home/ubuntu/Documents/workspace/blogapp/node_modules/loader-runner/lib/LoaderRunner.js:176:18
    at loadLoader (/home/ubuntu/Documents/workspace/blogapp/node_modules/loader-runner/lib/loadLoader.js:47:3)
    at iteratePitchingLoaders (/home/ubuntu/Documents/workspace/blogapp/node_modules/loader-runner/lib/LoaderRunner.js:169:2)
    at runLoaders (/home/ubuntu/Documents/workspace/blogapp/node_modules/loader-runner/lib/LoaderRunner.js:365:2)
    at NormalModule.doBuild (/home/ubuntu/Documents/workspace/blogapp/node_modules/webpack/lib/NormalModule.js:295:3)
    at NormalModule.build (/home/ubuntu/Documents/workspace/blogapp/node_modules/webpack/lib/NormalModule.js:446:15)
    at Compilation.buildModule (/home/ubuntu/Documents/workspace/blogapp/node_modules/webpack/lib/Compilation.js:739:10)
    at /home/ubuntu/Documents/workspace/blogapp/node_modules/webpack/lib/Compilation.js:1111:12
    at /home/ubuntu/Documents/workspace/blogapp/node_modules/webpack/lib/NormalModuleFactory.js:409:6
    at /home/ubuntu/Documents/workspace/blogapp/node_modules/webpack/lib/NormalModuleFactory.js:155:13
    at AsyncSeriesWaterfallHook.eval [as callAsync] (eval at create (/home/ubuntu/Documents/workspace/blogapp/node_modules/tapable...

• Fixes npm run build Error: Cannot find module 'less' #784

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