feat(dependabot): Added Dependabot

[yashisrani]

I added Depedabot to automate upgradation of dependancies for our website.

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[jayesh9747]

@yashisrani, why do we need this feature? Can you give some examples?

[yashisrani]

@jayesh9747 to bump all outdated dependencies. Currently Node.js 24 is running. But our website is still using Node 18, which is outdated.

[jayesh9747]

@yashisrani You need to add an auto-rollback in this PR, in case our site goes down due to the Node version change. We shouldn't proceed without it.

[yashisrani]

@jayesh9747 we can configure Dependabot to ignore major Node version updates and only allow minor or patch updates. this is also good idea ..

[jayesh9747]

@yashisrani still we need rollback functionallity.