remove discourse link from api-gateway

[rpaik]

Check List

• Tests has been run in packages where changes made if available
• Linter has been run for changed code
• Tests for the changes have been added if not covered yet
• Docs have been added / updated if required

Issue Reference this PR resolves

[For example #12]

Description of Changes Made (if issue reference is not provided)

[Description goes here]

[codecov]

Codecov Report

Base: 41.03% // Head: 82.12% // Increases project coverage by +41.09% 🎉

Coverage data is based on head (e46d3d3) compared to base (4d6511a).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #5855       +/-   ##
===========================================
+ Coverage   41.03%   82.12%   +41.09%     
===========================================
  Files         149      139       -10     
  Lines       19552    18910      -642     
  Branches     5090        0     -5090     
===========================================
+ Hits         8023    15530     +7507     
+ Misses      10709     3380     -7329     
+ Partials      820        0      -820     

Flag	Coverage Δ
cube-backend	?
cubesql	82.12% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...hema-compiler/src/extensions/extension.abstract.ts
...bejs-schema-compiler/src/compiler/CompilerCache.js
...-orchestrator/src/orchestrator/RedisCacheDriver.ts
...ges/cubejs-schema-compiler/src/parser/SqlParser.ts
...ema-compiler/src/compiler/CubeToMetaTransformer.js
...ubejs-schema-compiler/src/adapter/BigqueryQuery.js
...-orchestrator/src/orchestrator/LocalCacheDriver.ts
...ackages/cubejs-server-core/src/core/CompilerApi.js
...chestrator/src/orchestrator/RedisQueueEventsBus.ts
...ges/cubejs-schema-compiler/src/extensions/index.ts
... and 278 more

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[igorlukanin]

@rpaik Thanks for taking the lead on this!