Ignore code snippets in the Spell checker

[sm1990]

Description

The following GitHub action is used to check the spelling in our content.
https://github.com/ballerina-platform/ballerina-dev-website/blob/master/.github/workflows/spell-check.yml
https://github.com/ballerina-platform/ballerina-dev-website/blob/master/.github/scripts/spellcheck.py

The final report includes, the code snippets in the .md files.
eg:-
File: swan-lake/vs-code-extension/get-started.md Misspelled words: sdk:, [multi-root, 1.60.0, [multiple, later., command., workspace**, [ballerina](https://ballerina.io/downloads/)., multi-root, it., <img, ---, intro:, [visual, [ballerina, packages](#open-multiple-ballerina-packages), **vs, line,, workspace., keywords:, extension,, extension., ballerina,, ballerina, corner., ###, instructions,, ., workspace,, [single, editor](https://code.visualstudio.com/download), class="cinlineimage-half"/>, **file, description:, started,, editor,, package](#open-a-single-ballerina-package), file**, title:, <version>, editor., properly,, package., >info:, folder...**,, [adding, **add, package:, code, package,, ##, methods., time.

Improve the spell check script so that the inline code snippets (between two single (`) backticks ) and main code snippets (between three (```) backticks) are ignored.

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