Implementation for a filter on the home page

[hrishikeshpaul]

So suggested from the meetings we've had, we should implement a feature where the person can filter jobs by Skills.

Implementation Guidelines

1. In the filter drop down present on the homepage, add another option that says "Skills".
2. On clicking that option, the SkillSelect component should pop up beside the drop down.
3. The user can then then select skills (yes, there can be multiple skills), and the jobs will be shown accordingly.
4. Note, this will filter jobs that the user can already see. The user shouldn't be able to see jobs that are not shown to him due to the 'smart filter'.

@colen81 I have assigned you to this so that you and @RayZhang001 can coordinate and do this.