Changelog Page Development Stage

[MaedahBatool]

This issue tracks and monitors the progress of the development of the Changelog page. Attached to this is the list of all the tasks that need to be done.

### Tasks
- [ ] https://github.com/sourcegraph/docs/issues/524
- [ ] https://github.com/sourcegraph/docs/issues/525
- [ ] https://github.com/sourcegraph/docs/issues/526
- [ ] https://github.com/sourcegraph/docs/issues/527
- [ ] https://github.com/sourcegraph/docs/issues/528
- [ ] https://github.com/sourcegraph/docs/issues/529
- [ ] https://github.com/sourcegraph/docs/issues/530
- [ ] https://github.com/sourcegraph/docs/issues/531
- [ ] https://github.com/sourcegraph/docs/issues/532
- [ ] https://github.com/sourcegraph/docs/issues/533
- [ ] https://github.com/sourcegraph/docs/issues/534
- [ ] https://github.com/sourcegraph/docs/issues/535

[MaedahBatool]

@zahidalidev I have added all the tasks for you here. Let's track these now individually.

[zahidalidev]

Sure, thanks