chore: add transformations challenge announcement

[gitcommitshow]

Description

Add link to Transformations Month challenge - https://www.rudderstack.com/blog/join-the-transformations-challenge-for-a-chance-to-win/

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

Patch coverage: 83.82% and project coverage change: +0.31 🎉

Comparison is base (1b6af85) 53.09% compared to head (c3bc5af) 53.40%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3072      +/-   ##
==========================================
+ Coverage   53.09%   53.40%   +0.31%     
==========================================
  Files         332      342      +10     
  Lines       52350    52884     +534     
==========================================
+ Hits        27794    28242     +448     
- Misses      22956    23022      +66     
- Partials     1600     1620      +20     

Impacted Files	Coverage Δ
app/apphandlers/gatewayAppHandler.go	13.82% <ø> (ø)
app/apphandlers/setup.go	73.25% <ø> (ø)
gateway/internal/stats/stats.go	100.00% <ø> (ø)
jobsdb/admin.go	68.99% <0.00%> (ø)
runner/runner.go	69.66% <50.00%> (-0.61%)	⬇️
services/metric/registry.go	82.25% <50.00%> (-0.15%)	⬇️
testhelper/stats/prometheus.go	57.14% <57.14%> (ø)
regulation-worker/cmd/main.go	71.95% <62.50%> (-1.39%)	⬇️
services/stats/otel.go	73.00% <73.00%> (ø)
services/stats/statsd_measurement.go	75.55% <75.55%> (ø)
... and 22 more

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