feat(gui): serve index from all paths without extension

[lahabana]

• remove config.json
• use a templated index.html to dynamically set base paths
• serve index.html whenever the path points to a file that doesn't exist

Fix #5306

Signed-off-by: Charly Molter charly.molter@konghq.com

Checklist prior to review

• Link to docs PR or issue --
• Link to UI issue or PR --
• Is the issue worked on linked? --
• The PR does not hardcode values that might break projects that depend on kuma (e.g. "kumahq" as a image registry) --
• The PR will work for both Linux and Windows, system specific functions like syscall.Mkfifo have equivalent implementation on the other OS --
• Unit Tests --
• E2E Tests --
• Manual Universal Tests --
• Manual Kubernetes Tests --
• Do you need to update UPGRADE.md? --
• Does it need to be backported according to the backporting policy? --
• Do you need to explicitly set a > Changelog: entry here or add a ci/ label to run fewer/more tests?

[johncowen]

serve index.html whenever the path doesn't have an extension

Not sure if I understood this correctly but does this mean that:

http://localhost:8080/mesh/default/data-planes/cluster-1.backend-02

would not serve index.html? (the path extension being .backend-02)

[kleinfreund]

Not sure if I understood this correctly but does this mean that:

http://localhost:8080/mesh/default/data-planes/cluster-1.backend-02

would not serve index.html? (the path extension being .backend-02)

@johncowen I do believe that will indeed be an issue.