Updated dev docs - setup issues

[tuncK]

Following the current instructions, nodejs=18.15.0 gets installed, which results in an error like this:

~/galaxy-language-server/client$ npm run webpack

galaxy-tools@0.10.2 webpack
webpack --mode development

[webpack-cli] /home/tunc/galaxy-language-server/client/node_modules/webpack/lib/cli.js:68
/(\p{Uppercase_Letter}+|\p{Lowercase_Letter}|\d)(\p{Uppercase_Letter}+)/gu,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

SyntaxError: Invalid regular expression: /(\p{Uppercase_Letter}+|\p{Lowercase_Letter}|\d)(\p{Uppercase_Letter}+)/: Invalid property name
at internalCompileFunction (node:internal/vm:73:18)
at wrapSafe (node:internal/modules/cjs/loader:1176:20)
at Module._compile (node:internal/modules/cjs/loader:1218:27)
at Module._extensions..js (node:internal/modules/cjs/loader:1308:10)
at Module.load (node:internal/modules/cjs/loader:1117:32)
at Module._load (node:internal/modules/cjs/loader:958:12)
at Module.require (node:internal/modules/cjs/loader:1141:19)
at require (node:internal/modules/cjs/helpers:110:18)
at get cli (/home/tunc/galaxy-language-server/client/node_modules/webpack/lib/index.js:129:10)
at Function.cli (/home/tunc/galaxy-language-server/client/node_modules/webpack/lib/util/memoize.js:22:13)

[davelopez]

Thank you so much @tuncK!