Highlight StackExchange when creating an issue

[cmichi]

I noticed Substrate does the same here: https://github.com/paritytech/substrate/issues/new/choose.

I think it's a good idea.

[codecov-commenter]

Codecov Report

Merging #1201 (f050997) into master (0eed1aa) will increase coverage by 17.31%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #1201       +/-   ##
===========================================
+ Coverage   61.72%   79.03%   +17.31%     
===========================================
  Files         228      229        +1     
  Lines        8637     8667       +30     
===========================================
+ Hits         5331     6850     +1519     
+ Misses       3306     1817     -1489     

Impacted Files	Coverage Δ
crates/allocator/src/bump.rs	0.00% <0.00%> (ø)
crates/storage/src/traits/impls/prims.rs	96.92% <0.00%> (+1.53%)	⬆️
crates/lang/ir/src/ir/attrs.rs	82.27% <0.00%> (+3.60%)	⬆️
...ates/storage/src/collections/hashmap/fuzz_tests.rs	100.00% <0.00%> (+4.25%)	⬆️
crates/metadata/src/layout/mod.rs	77.01% <0.00%> (+4.59%)	⬆️
crates/lang/ir/src/ir/trait_def/item/mod.rs	90.16% <0.00%> (+4.91%)	⬆️
crates/env/src/engine/off_chain/test_api.rs	90.00% <0.00%> (+6.00%)	⬆️
crates/lang/ir/src/ir/item_impl/constructor.rs	93.84% <0.00%> (+6.15%)	⬆️
crates/env/src/engine/off_chain/impls.rs	43.03% <0.00%> (+8.22%)	⬆️
crates/lang/ir/src/ir/idents_lint.rs	71.42% <0.00%> (+9.52%)	⬆️
... and 51 more

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