add web3-eth-account guide

[luu-alex]

Description

#6258
doc includes:

• Executable examples
• Local wallet
• Signing
  replaced some privatekeys in docs to a place header

Please include a summary of the changes and be sure to follow our Contribution Guidelines.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I have selected the correct base branch.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• Any dependent changes have been merged and published in downstream modules.
• I ran npm run lint with success and extended the tests and types if necessary.
• I ran npm run test:unit with success.
• I ran npm run test:coverage and my test cases cover all the lines and branches of the added code.
• I ran npm run build and tested dist/web3.min.js in a browser.
• I have tested my code on the live network.
• I have checked the Deploy Preview and it looks correct.
• I have updated the CHANGELOG.md file in the root folder.
• I have linked Issue(s) with this PR in "Linked Issues" menu.

[github-actions]

Bundle Stats

Hey there, this message comes from a github action that helps you and reviewers to understand how these changes affect the size of this project's bundle.

As this PR is updated, I'll keep you updated on how the bundle size is impacted.

Total

Asset	Old size	New size	Diff	Diff %
Total	0	590 KB	590 KB	-

View detailed bundle breakdown

Added

Asset	Old size	New size	Diff	Diff %
web3.min.js	0	572 KB	572 KB	-
../lib/commonjs/index.d.ts	0	8.63 KB	8.63 KB	-
../lib/commonjs/accounts.d.ts	0	3.89 KB	3.89 KB	-
../lib/commonjs/types.d.ts	0	2.45 KB	2.45 KB	-
../lib/commonjs/web3.d.ts	0	1.14 KB	1.14 KB	-
../lib/commonjs/abi.d.ts	0	1000 bytes	1000 bytes	-
../lib/commonjs/eth.exports.d.ts	0	280 bytes	280 bytes	-
../lib/commonjs/providers.exports.d.ts	0	148 bytes	148 bytes	-
../lib/commonjs/version.d.ts	0	60 bytes	60 bytes	-

Removed

No assets were removed

Bigger

No assets were bigger

Smaller

No assets were smaller

Unchanged

No assets were unchanged

[cloudflare-workers-and-pages]

Deploying with    Cloudflare Pages

Latest commit:	08dadd9
Status:	✅  Deploy successful!
Preview URL:	https://26111028.web3-js-docs.pages.dev
Branch Preview URL:	https://6258.web3-js-docs.pages.dev

View logs

[codecov]

Codecov Report

Merging #6617 (08dadd9) into 4.x (20cc5da) will increase coverage by 1.03%.
Report is 10 commits behind head on 4.x.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##              4.x    #6617      +/-   ##
==========================================
+ Coverage   89.36%   90.39%   +1.03%     
==========================================
  Files         215      215              
  Lines        8309     8322      +13     
  Branches     2248     2247       -1     
==========================================
+ Hits         7425     7523      +98     
+ Misses        884      799      -85     

Flag	Coverage Δ
UnitTests	90.39% <ø> (+1.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
web3	∅ <ø> (∅)
web3-core	∅ <ø> (∅)
web3-errors	∅ <ø> (∅)
web3-eth	∅ <ø> (∅)
web3-eth-abi	∅ <ø> (∅)
web3-eth-accounts	∅ <ø> (∅)
web3-eth-contract	∅ <ø> (∅)
web3-eth-ens	∅ <ø> (∅)
web3-eth-iban	∅ <ø> (∅)
web3-eth-personal	∅ <ø> (∅)
web3-net	∅ <ø> (∅)
web3-providers-http	∅ <ø> (∅)
web3-providers-ipc	∅ <ø> (∅)
web3-providers-ws	∅ <ø> (∅)
web3-rpc-methods	∅ <ø> (∅)
web3-utils	∅ <ø> (∅)
web3-validator	∅ <ø> (∅)

[jdevcs]

also add example of contract using local web3 wallet for implicitly signing a tx for .send()
@luu-alex

[Muhammad-Altabba]

I have few requests, please.

[jdevcs]

approving, you may merge PR after addressing feedback, thanks