Add page not found banner

[Tguntenaar]

Resolves #970

[Megha-Dev-19]

LGTM

[Megha-Dev-19]

can you please add it for the rfp page as well. thanks!

[Tguntenaar]

Yes done

[Megha-Dev-19]

@race-of-sloths include

[Megha-Dev-19]

@race-of-sloths score 3

[race-of-sloths]

@Tguntenaar Thank you for your contribution! Your pull request is now a part of the Race of Sloths!
Weekly streak is on the road, smart strategy! Secure your streak with another PR!

Current status: executed

Reviewer	Score
@Megha-Dev-19	3

Your contribution is much appreciated with a final score of 3!
You have received 50 (30 base + 20 weekly bonus) Sloth points for this contribution

Another weekly streak completed, well done @Tguntenaar! To keep your weekly streak and get another bonus make pull request next week! Looking forward to see you in race-of-sloths

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