Front-end implementation of the Anonymous feature

[Hakaabi]

Merged changes made here after ensuring they passed to the branch 'Adding-anonymous-sprint1' to be able to connect the back-end to the front-end changes made in this branch.

Files modified and why:

1..gitignore
Modified the file to access the folder path 'node-modules/nodebb-plugin-composer-default/' because the draft front-end file which is 'composer-title-container.tpl' is located in the path.

2.../composer-title-container.tpl
-Adjusted the title box size for better layout and design, making space for the anonymous posting checkbox.
-Added a 'Post Anonymously' checkbox next to the hide button, ensuring it blends with the existing button styles for a cohesive user interface.

3.public/language/en-GB/topic.json
Added the key "composer.post-anonymously": "Post Anonymously", allowing the checkbox label to display as 'Post Anonymously' in the front-end interface

These changes aim to resolve the issue #18.

[coveralls]

Pull Request Test Coverage Report for Build 11149719645

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.005%) to 82.754%

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Totals
Change from base Build 11059941294:	0.005%
Covered Lines:	22357
Relevant Lines:	25601

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💛 - Coveralls